I own or have owned Glocks from 3 generations, gen 2-gen4. I started to notice a positive trend regarding the .40 cal gen 4s. (I don't have any experience with Gen 4 9mms.) The newer they are, the better and smoother they seem. I was comparing my new Gen 4 23, which was test fired at the end of Feb 2012, to an older Gen 4 .40. The differences were easily noticed; in fact, they don't even seem like they were made by the same company. Anyway, I took a Gen 3 23, the new Gen 4 23, and a older Gen 4 22 to the range to do a more in depth comparison. I shot 125 rounds through each, with zero malfunctions. For those who care, I had a friend watch how each one ejected, and the newer Gen 4 was actually more forceful of the three with a more constant pattern. (I personally don't care about that, I never paid any attention to it. However, for the sake of the people who are concerned, I decided to note the pattern.) One of the most interesting things I noted was the difference in recoil. I am not really recoil sensitive, and don't find the .40 to be a bother at all. Still, I found it interesting feeling all three and making the comparison. The newest Gen 4s recoil characteristics was noticeably different. I was able to shoot it as fast and accurate as my G 19 loaded with +p ammo. Surprisingly, the Gen 3 23 was actually better than the older Gen 4 22. Upon closer inspection of the two Gen 4s RSAs, I understand why they were upgrades. The older Gen 4 RSA was sloppy when compared to the newer Gen 4. I actually called for the updated one for my older gen 4 when I got home. Trigger pull: The newest Gen 4 with the dot connector was the best, followed closely by the Gen 3, with the older gen 4 bringing up the rear again. Accuracy was the same order as well. I guess, the point to this long thread is I firmly believe the newest gen 4s are now what we expect Glock to be. I admit, I didn't think anything was really wrong with the older gen 4s. That changed after this comparison. While I still think the older ones were reliable for most, the difference in quality is noticeable. I highly recommend the new Gen 4s. After shooting and comparing to other Generations and even other manufacturers, I am convinced the newer Gen 4s are probably the best value out there. (At least in my area, the price difference is less than the cost of the third mag you get.) One last thing. The highlight of the whole day was when someone with a custom shop S&W 686 was scoffing a my Glock. She touched off two full powered .357 rounds and that stupid trigger lock engaged locking the hammer to the rear. She wasn't able to get it working with the supplied key.