I've been using my 5D II for about a year now, as a replacement to my 5D, now relegated to spare wedding camera. I debated the 7D at the time, as it was a fair bit cheaper, and with a few extra features.
However, I've got used to full frames, both in terms of images quality and lack of crop-ratio.

It certainly hasn't disappointed. I've wracked up over 100,000 photos on it, shot several weddings, loads of stock and a few commercial shoots.
My first wedding with the 5DII was mid winter, and really dark. I never went below 5000 ISO - not something I'd do on a lesser camera - and was seriously impressed with the results. I'm an advocate of whacking ISO up when needed - better a noisy shot than a blurred one. Noise control is pretty good, though that's improving with each new model.
Focusing still isn't it's strength, but it good enough at weddings.

Annoyingly I dropped it doing a beach shoot, and cracked the top display screen. I was quite surprised at this, it's a pretty tough bit of kit generally, and has taken a few knocks over the last year.

All in all another top quality camera - perfect for weddings and landscapes.