About carrying concealed, the sights seem to just tear up my shirts. The cause was the rear sight regardless of make, model, or method of carry.
I have a Glock 22 with stock Trijicons on it. I usually carried it in the winter time IWB, or under a shirt. The rear sights(Trijicons) tore up my shirts.
I recently traded a Glock 27 with Heinie Straight Eights (nite sites) on it for a stock H&K USP 45 Compact. I think that the Henie sights are alright, not really any better than trijicons and meprollights. The 27 was my primary carry weapon for over a year and a half, but I could never adjust to shooting it well enough to suit my desires and the Heinie sights tore up my shirts, so I upgraded to a H&K 45C (the gun just suited me better and it was more rounded overall than my 27).
I am putting a set of novak night sights on the H&K with some minor custom "fitting" by a trusted smith; they are sweeeeeeeet sights!
Let all of us know if you have any experience with carry sights that are great, good, ok, or just plain suck.
Thanks,
Tony