I like the slightly slimmer grip, the texture, and the newer mag release a bit more than the Gen 3s although I'm up in the air on the new recoil spring assembly. I don't own a Glock at the moment but there's a chance that I might buy one this year. I don't know if I'll go with Gen3 or Gen4. I don't think the new stuff is a dealmaker or a dealbreaker but I'm leaning towards the 4 a little. The 23/19 should be out at some point this summer I hear. There's a number of pistols on my wish list so I might skip it altogether. After all, a Glock is a Glock is a Glock. I can buy one almost anywhere at any gun shop any time.