I personally own all of the Glock generations and all are excellent handguns. There are no longer any mechanical problems with the Gen-4. Initially they tried a different type of extractor, which worked, but some had a tendency to throw the cases back at the shooter. The other problem was breaking the guide rod spring. Both these problems were resolved with reverting back to the old extractor and a new metal supported guide rod with a double spring. The grip checkering on the Gen-4 is a little more aggressive, which I like. The Gen-4 comes standard with an extended slide lock/release, which I had to change out on my other Glocks. The Gen-4 G-34 & G-35 also come standard with a 3.5# connector, also something I had to change out on my other Glocks. I really like my Gen-4 and would recommend it, as there is talk that it may soon only be available to law enforcement, but whether you want to pay extra for a Gen-4 is up to you.