I've been a long time user of this strap. Almost every single one of my guitars (20+) are equipped with one. That basically sums up what I think of it.
The strap ends attach firmly to your guitar. Slightly larger screws make sure it goes in place and it won't come out. They go flush with the guitar body, so, no space wasted.
The clip buckles in really nice and smoothly. They are done with military-grade plastic, so, no risk of breaking or warping (and very tough to get scratched).
You have to be careful when storing the guitar, because the buckles may dent the finish. Just make sure to put them out of the way and use a soft cloth between them and the guitar body, so they won't touch the body.
The strap itself, for my liking, is a bit too long. Nothing that won't get solved with a needle and string, and it will improve your sowing techniques as well. :-D
Summing up: if you want a strap lock to last forever, BUY IT NOW! Your shoulder may fall off of your body, but the strap will remain attached even through WW3!