I fired a gen 5. Nice gun. Being that I am righty and have small/medium hands, I will stick to my gen 4's (just not enough of a reason to upgrade). For lefty's or those with bigger hands the gen 5 is nice. Though slighty thicker, the ambi slide catch/release, no finger grooves, and upgraded trigger, are definitely improvements. I also like the flared magwell and standard rifling on the barrel (no ammo concerns and easier to clean). Still doesn't come with night sites tho... come on glock, sig p320's do!!!