Good disc lock for a number of reasons: Fits in my pocket which gives me no reason not to take with me and actually use the lock, thick pin which is hard to gain access to for disc cutters, fits the Pragmasis chains for double use.
Looks the business to deter opportunist thieves.

Bought this lock after seeing a review on youtube from Bennets. Great product, feels very solid, and compact enough to push into my pocket. Looks like it would take some getting off.
I even wrapped some bright electrical tape around the cylinder so it stands out more. Very pleased, and a great price. Link below
https://www.youtube.com/watch?v=eosFWnE9oaE

I was looking for a new lock for a while. Looking for the impossible: doesn't brake the bank but is seriously good security. I wasn't sure about the RoundLock but after a bit of research I was damn near convinced. Then I watched the LockPickingLawyer video picking it. He points out that the average thief couldn't get into this which leaves cutting as the only option, then demonstrated how insanely difficult it would be to cut. I was sold!
I've now been using it since September 2020 and have found it perfect - currently using it as a Disc-lock.

Can't beat this product for the price. |The portability especially makes it a winner. The actual pin is quite thick so you will need a sizable aperture in your disk to allow it to fit. Check before you buy.

Like the heading, it’s sturdy and fits well.
Fingers crossed I’ll never have to find out regarding endurance against attack but great little lock as part of your security.

There's always one isn't there ?
[Pragmasis Comment:]
We have tried to make contact with that gentleman, repeatedly. Our offer to refund him still stands if he returns his lock in sellable condition.
(People might think we delete all the low scores, but we don't and we never have.) Thanks again for your other comment.

Really nicely made lock, and it operates very smoothly which I always think is a sign of quality. Unlike "dale" with the 1-star review, I actually checked that this would fit my bike first.. I mean, why wouldn't you? I assume he's the sort of person that answers Amazon questions with "sorry, don't know"...

I'm using it as a disk lock to replace my venerable Squire ML2L (which back in the day was also considered a good lock). The squire's narrow shackle is awkward to fit to my current bike, but the roundlock slots straight between disk and carrier, and is much easier to use, and more compact to carry. There's also room to thread it through a 'telltale' cable (typically hooked to the clutch lever as a reminder) if required.

I also like the flexibility of being able to use it with a chain in the future if I need to.

I have one suggestion, it might be nice if you could source some kind of carry/storage pouch (the squire has a tough cordura style one). I think this would be really handy to have - especially if using this as just a disk lock rather than with a chain. If I find one that works I'll let you know.
[Pragmasis Comment:]
A carry pouch is an interesting idea. You're the first to suggest that for the RoundLock. I kind of thought it was compact enough to fit in a pocket pretty well as-is and that might be better than having a separate pouch that you also need to carry. It's an interesting idea, though, and we would be grateful if you find anything suitable?
Incidentally, yes, the old ML2L was a pretty good lock. Squire stopped making it when they realised they were actually losing money on every one!

I would like to make clear that my 1 star was a typo mistake against a previous review.

I only ever deal with Pragmasis for my motorcycle security,the best company and service you will find.

I hope that clears that issue.
[Pragmasis Comment:]
Brill. Thanks for clarifying. The IP address you are using now matches what you used previously so I will change the score on your other comment to match what you've selected here as that reflects your opinion of our products. Thanks again. We really do take all this stuff seriously (and we're still hoping to get in touch with the other chap!).

Very high quality lock at a great price. I use it as a front disc lock when out and about. Short of a thief angle-grinding through your front disc, this cannot be removed by force. Fast delivery, and great comms.

Just bought this to replace my ss50cs lock for my 13mm chain, great fit, thank you David for the advice and great customer service.

Looks very sturdy and secure. Easy to carry as a disc lock as well. Would be even better if alarmed

Not the first time I’ve purchased from this company. Good customer service as they make contact and let me know the status of my order and expected time. The lock is an addition to my bike for when I’m out. It looks very sturdy and not too heavy but also give me confidence that it will give thieves a good challenge if I ever leave my motorcycle for a short time. It was in my hands within 2 days. Thanks David.

5 stars for the lock and to this company, couldn't do enough for you and kept you informed all the way through.
For something so small I can not see how you would defeat this lock, it's tough, solid and awkward to even try and attack.

Great Lock!, because of the ball bearings and such if you leave this lock outside a lot it does need some oiling, but this lock is fantastic. An example of true engineering, doing a lot with a little.

Love the compactness of this lock, especially given the level of security it offers! Works really well with a 16mm chain. Highly recommend.

I've two now and they are an excellent compact unit which fits the 16mm links perfectly. Great reviews from the security experts. Excellent value for money.

Have waited a few months to review this great lock. It's been used so far as a disc lock on a covered bike outside. It's showing no signs of degradation after a tough winter only 200m from the sea. The keyway is still slick to use and you'd need Lockpickinglawyer skills to pick it. It fits easily in a pocket or under the seat for on the go security. It would be a tough lock to physically attack due to its roundness and the fact the two sections spin independently of each other. Highly recommend.

A good product backed by honourable people.

Great product and excellent communication with David throughout the purchase/shipping process - highly recommend

Got this to go with a 14mm Pragmasis chain I bought a few years ago.
Fits very well through link with only small gap.
Centre pin is very thick so don't think it would be quick to cut with a disc cutter. I expect anyone would therefore go for the chain.
I had my doubts about its use as a disk lock but it does work on my bike with cast wheels - goes between the cast centre and the disc. It may not work for all types.
The lock itself is very smooth and easy to use.
Overall I'm very pleased especially at the price - you can't buy a better lock for that money.
Pragmasis were as usual very quick and efficient.

The disk lock is heavy duty and fits the disc perfect. For the price it’s a bargain Oh and fast delivery as well.

Excellent service

I am very pleased with the roundlock. I only use it as a disc lock, added my own ‘Remove before Flight’ warning safety pin and it is great. I can sleep a bit better at night now
I was previously using an Oxford Omega disc lock, but these are ridiculously easy to break after checking-out some YouTube videos.
If I could improve it, I’d make the black plastic on it dayglo or red colour to be more noticeable as a disc lock.
Service was good, ordered it late on Monday and got it Wednesday.

I just got it. It feels really solid and well built.
It was delivered to dublin in few days.

After seeing a Bennetts Insurance Youtube video where they were rated very highly by the real world tester I ordered two of these with matching keys. That gives me six keys, any one of which will open the locks, so I can carry a couple of spares with me and still have some at home. The locks themselves are excellent quality and feel pretty heavy duty. I am very pleased with my purchase.

Perfect, hard to use bolt cutters on it not easy to pick in public i expect, just check it will fit your disc first or it makes an excellent lock for a chain.Fast delivery.

My MT07 was recently stolen so upgrading security for my next bike. This has consistently been recommended as one of the best disc locks you can buy - I’ll be investing in their chains too. You’ll have to Houdini to steal my freaking bike!

These guys take security very seriously, know their products and are willing to advise to make sure the customer gets best option for the application/s .... my order has included Noose Chains, Round Locks & Dib Locks all keyed alike ... SFB have been happy to split orders to get what I needed and the quality of the items received are top notch! .... any trustworthy security is going to represent a high outlay but compared to what else is on the market I have what I need and can trust at a fair price and delivered quickly too ...Thank you SFB!

I got this after reading some excellent reviews, and I am not disappointed. It's small and easily portable, can double as a disc lock and as a chain padlock. It's polished and well finished. Now I am not an expert lock-picker or padlock breaker frankly, and I have the feeling that this is going to be tough for the baddies to crack. Definitely recommended. Only glitch the plastic keyhole cap broke after a few weeks, a minor thing, I will try to replace it.
[Pragmasis Comment: We are happy to replace the broken cap free of charge. Apologies for the inconvenience.]

super strong super simple and super service, Buy one today you will not be sorry

Does what it says on the tin. Fast and efficient service this the second time i have used Pragmasis for security for my Honda. Quality products and quality service. Would recommend