Yep. That's the link. I've got two fiber optic sights from czcustom, and they've been very good. I've got enough rounds through a 75B to know that it's very accurate. I've had my P01 out shooting once, and I've nothing to complain about, though I haven't put in time really testing the accuracy.
I guess there was one thing, but it was small. In the second one the fiber came loose just a bit, but I took a soldering iron and widened the muzzle end of the fiber rod slightly and it's great now. It melted pretty readily in just a few minutes.
I bought an extra fiber rod in case I should catch one on something and break mine. It's several inches long, so I should have plenty to make replacements (or mistakes) if I need to.
In short, I find the sights bright and easy to pick up, and I like them. I didn't do the fitting myself, but had a guy in town do it. The 75B was straightforward, the P01 was a bit tighter and took more effort/time. In each case, I chose the thinner fiber-optic rod that czcustom carries (they have two sizes as I recall, and recommend the finer rod on the site).
http://czcustom.com/CZ-Fiber-Optic-Front-Sight-5.5mm-with-1.0mm-Rod-Standard.aspx