I don't really have the criteria to really evaluate this product because it is the first clasp of this type I've experienced, but I have to say it feels great; it is very solid and secure. It feels serious put together in the DeBeer sports leather strap....it works AWESOME for me!!
This seems to be a fairly high quality clasp. The mechanism isn't as smooth as others that I've used, which is why I've deducted one star. Other than that, the workmanship seems good. The steel is polished to a very high shine. The reason I chose this clasp is that it advertises a 4mm thickness, and it delivers. I am able to use it with my 4mm-thick 18-mm Hirsch Liberty Strap. It was a tight fit (I actually used a pair of pliers to pull the buckle end through the clasp), but it appears sturdy and is comfortable.
I'm using this on my Seiko. It is high quality and comfortable.
I avoided buying cheaper clasps with mixed reviews, but this one is nice. Everything seems heavy gauge, the closure feels secure, it has milled, not stamped parts, and the spring bar is beefy too. I just put it on so we'll see how it holds up, but I don't see any problems. To get the right size, be sure to measure your existing strap at the buckle.