Hello. I would like some opinions regarding some "tactical" scopes, namely: Ior Valdada 3.5-18x50, Leupold Mark 4 10x40, Vortex Razor HD 5-20x50, and the SWFA SS 10x42. I just want some background info (and, like I said before, opinions) regarding these scopes and anything I should be wary of if I go for one. Thanks!