Works for me (EU).

I've been trying to use my $29.99 black friday Playstation Plus card but it won't work. Hopefully it is down.

Since it is free you can't complain.

Problems here since before I left this morning for the office with PS4. Did some digging and found this:

http://www.gamespot.com/articles/sony-temporarily-disables-psn-features-for-smooth-ps4-eu-launch/1100-6416484/

This fits my problem but yours could be something else.

It's stopped saying maintenance, but still doesn't work for me

It's working right now but it's giving me the occasional error code. Should be better tomorrow. I'll concede to the PS4 owners today.

Oh yeah I forgot about PS4 launching in Europe today. 

And THIS....is why I might sell my PS4 and get an Xbone. When I got mine on launch? Thing didn't work right for a few DAYS. I know it's because of launch but it worries me. Xbox One had just as many people connecting at once, but didn't have one single server issue and when you think about just how much these new consoles rely on the internet to function properly? Something like online stability becomes much more important imo.

I was on for the past hour. Shut the console off just now. PSN has been working fine for me.

Hasn't worked right for me. It's been screwing with my PS+ code I got this morning cause of the Black Friday sale. It failed at the last confirmation step and got a error code. It doesn't exist in my transaction history. Nor did it activate. And when I go to the PS4 store to try redeeming it again, I got it through amazon.com. It backs me out to the main menu. When I try it on my PS3. It throws up error codes. I'm basically waiting till tomorrow. If it doesn't work till then, I have to call costumer service.