Bought PS4 and Xbox One.
PS4 fan was loud on first night, and sometime during the night totally failed, causing system to overheat in minutes. Going through SCEA warranty has been smooth and fast (started talking to customer service on wednesday, received coffin on thursday, got confirmation of coffin reception on friday, and should get exchange unit on monday or tuesday; they're covering 100% of the cost).
Xbox One has no issues after 24 hours, but I haven't tried the disc drive.
I got a ps4 at launch, but didn't get to first use it till last Monday. I connected it through wifi and the patch went by fast in about 15 minutes it was up and running. The only problem I ran into was connecting it to Facebook. It froze on that screen for about 45 minutes.
I received my PS4 on launch and besides not being able to sign in for the first few hours on launch day I've had no problems. At the last minute I decided to cancel my XBO pre-order so I can't really comment on it. I'll probably end up picking one up some time next year though.
Closest thing to a problem I've had is with Battlefield crashing and erasing my save over and over. Good thing I'm just playing multiplayer.
A 2 second google search would have told you thats related to EA not being able to start sell ing finished games than a problem with the console itself. BF4 is SimCity 2.0.