Saw these awhile back and finally ordered one in red. Took it to the range for a spin on a borrowed G17. Up close two eyes open shooting it worked very well, say 15yds and in. Trying barricade or one eye was alot more difficult on first time out. The round hits where the dot is so you have to cover where you are shooting amd of course this makes for alot more challenging day. For example head shots from distance or shooting barricade from 25 or 50 yds. Cool sight though, just going to take some getting used to having just a rear sight and no front. Alot like a red dot but only fiber optic and tritium with no added mass or new holsters etc.