I had one; didn't care for it
For some reason, I couldn't shoot it any better than I could shoot a 17. Lighter trigger, longer sight radius. Should make the difference, but it didn't for me. I think it was that mushy trigger action.
I thought the proportions were great. The construction, from a pure engineering standpoint, was brilliant. All you need is a home-made punch to detail strip it.
I also didn't care for the extended mag release button. It dug into my thumb under recoil. Good idea, but it just didn't work. The finger grooves on the front of the grip seemed like it would make it much more comfortable than previous Glocks, but it was only a small improvement. It is not in the same league as the Walther P99, for example.
If you want that type of gun, get a P99 or save a few bucks and get a Glock 17.