I bought one.
I used it as a reward to myself for not drinking as much. Instead of buying a 12-pack or two a week, I'd buy a 6-pack, and put the rest of the money towards the PS4. It was a pretty decent way to get myself to be a little bit more healthy.
I had to pick it up at midnight since I'm working doubles today and tomorrow, and Gamestop will only hold it for 48 hours even though it's completely paid for. I went after I got out of work at 10PM. They gave you a stamped receipt with a number on it, and at 1145, they lined everyone up by number, and at midnight they started handing the consoles out. I was #54 and had the console in my hands by 10 past.
Setup was a snap. I had the update already downloaded to a USB stick, and it took all of five minutes to run it and have me into the system. I don't know that I really needed to pre-download it anyway, as I was able to get the Playstation Plus games from PSN without a hitch, too.
Played a little bit of Resogun, one of the PS+ games, and man is it fun. Of course, I've always been a sucker for bullet **** shmups, so there's that.
Killzone is gorgeous. I know that 60FPS is pretty standard on PC games, but I've gotten used to the lower caps on consoles. Since I almost never play first-person shooters on my computer, almost all of my experience with them is on consoles at a lower framerate, so the jump is extremely noticeable to me. Dialog is a little rough at times, but the setting is cool to me. I only played for maybe a half hour or 45 minutes, so I didn't get to do too much.
The controller as a whole is a vast improvement in my mind over the DualShock 3. The buttons seem a little smaller and closer together, but I'm not sure. The trackpad adds enough bulk to the controller so that it's overall more comfortable in my hands than the DS3. The thumbsticks are great, and the concave triggers are a fantastic change. The controller is a little lighter than I'd prefer, but it doesn't feel cheap.
The system itself is pretty slim. I have a fatty PS3, and an Elite 360, and this thing is just super small compared to them. I didn't buy the vertical stand for it, but it stands up well on its own and seems very stable. I don't have room for horizontal positioning, unless I want it trapped in the entertainment center with the cable box and all that heat. I'll pass on that. Had zero issues with the HDMI port. Only problem I had was with the optical audio port, where I couldn't get my cable to seat properly, but I'm pretty sure it's the cord at this point, since I've had the same issue on a few other devices. Not a big deal for me, since I just use it for a wireless headset. I'm going to grab a new cable and see how that works.
One of the things I didn't like was that while there's some TwitchTV integration, it seemed like you could only watch other people's PS4 streams. I don't think that you have full access to TwitchTV. There's no other app to download. Could be that I was just missing something when I pulled it up, but if I wanted to watch some Starcraft or something, I didn't see a way to do so.