OK so I got it and its pretty awesome!
There are a few apps which need to be ported from windows phone 7 such as The harvest and Endomondo sports tracker which I miss but apart from that most stuff is there!
Virgin (on the T mobile network in the UK) gave me a bit of trouble as their sim only rolling contracts don't have micro-sims yet so I had to get creative with a pair of scissors. It all turned out fine.
Virign Mobiles customer services could do with a bit of improving compared to Tesco mobile though. They had a system crash the first time I called which wasn't a good impression for someone porting in. Luckily the port went fine.
The only thing I haven't figured out yet is the NFC payments. I think this is more down to my card than the phone.
Here is a review: http://www.wpcentral.com/nokia-lumia-920-review