I waited a long time before the Gen 4's came out, I never liked the feel of the earlier models, so I jumped on the Gen 4 when it was released , I don't have anything bad to say about my Gen 4's , love them all, but my new Gen 5 G19 with Ameriglow night sights is a nice improvement for me, I like every new feature Glock made, being a lefty I really like the AMBI slide release, that actually works without having to use two hands to make it work like so many other guns on the market that say their guns are ambi, and I like the full grip I now get with the finger grooves removed, I find the trigger to be as nice as the upgrades I did on my other Gen 4's, and most likely won't need to do anything on the trigger, it works great, the new barrel is without a doubt more accurate than my Gen 4's, not a lot, but enough to see on paper that there is a nice difference with closer grouping, the new finish is a deep black and very smooth and looks fantastic, the bull nosed slide at the mussel is a nice touch , and for anyone that carry's like me will be appreciated, when reholstering , the orange follower is also a nice touch, it gives me a fast look at where I'm at with ammo, and my eyes appreciate that, and as Slugo pointed out the added grip panels, give the user the option to build the grip to suit their own needs, because the new Gen 5's are now out and on the shelves, good buys are to be had on Gen 3's and Gen 4's, and you can save a few bucks, these Glocks are all good, so you can't go wrong with any of them, I have a Gen 5 G-17 on it's way, also with Ameriglow night sights, but these new guns will not be replacing my other ones, each one of my Glocks are set up for a purpose, and all are good...