I have the Sidewinder LX on my Old Glory and I really like the sight, very bright and tough. There are several small problems I have found with it though, first, everything must be locked down with lock-tite as the screws can easily come loose and rattle. Also, the tuning knobs are a hit or miss with me, I find them useful but they can cause some headaches. I would like them to be more like the knobs on the TR sights where you didn't have to loosen a screw to turn them and then re-tighten the screw when done. Other than that I am very satisfied with the sight and I havn't had any problems with the fiber optics, I have drug the bow through some thick brush without any problems as well as having it in some very cold temps.