I had bought a G5 optix last year and had a sight pin screw break. They say to get it tight, but don't over-tighten. I didn't think it was even snug when it broke. Called G5, no prblem, they'll send me a new one. 3 days later, got a package of 5 screws. Went to replace the one that broke, being sure to not over-tighten, and it broke. Some people swear by them, but I personally thought that they needed to redesign that sight pin screw. I also thought, IMO, that they made noise when shooting, not just on my bow, but a friends Mathews also. But you may find them great, I just didn't want the problems, it was $175 mistake for me!