I put them on my XD45C and 40sc. I needed almost no time into transitioning from standard Glock 26/19 sights I had before. Maybe 50 rounds at most. I was able to complete a LEO qualification course with a score of 242/250 with these sights and my XD45C. I think the trigger job may have helped a bit. Anyway, great sights, fast acquisition, accurate (good enough to hit a silhouette inside the 7 ring at 25 yards)and great tritium inserts that are super bright at night. YMMV though depending on your experience.