I have had a pair of these for a year or so, and also a set of the more traditional leather buckle type.
I far prefer these ice the buckle. Faster and easier to get on (and off). Can make the fit except what you need it to be, and still won't come off until you allow then to come off.
Now with a set of 4... I'm set.. any one into bondage, or even wanting to give it a go.. there are affordable, and quality!
I really liked the cuffs themselves - they're great cuffs and very comfortable. It's only downfall is that they don't have a second D ring so I can't attach another set , which to me is a big deal. This set also comes with a cheap little blindfold, which does work, but is very small and thin.