I have 24/7 Big Dot on my G17, Tru Glo on my G19, Trijicon on my G22, AmeriGlo I Dot Operators on my G20, Meprolights on my G26, I like the 24/7 Big Dots and Meprolights best. The 24/7 are faster to aquire a good sight picture, but the meprolights are the same size, height as the original Glock sights. Most of the aftermarket night sights have a much taller than stock, front blade sight, creating the possibility of snagging the front blade on your holster while drawing out. The AmeriGlo I Dots are good too, but not as fast as the 27/7 and the front blade is a good bit taller than stock.