I have a galaxy s3 on contract in the uk - my first android after years with the iphone. Very impressed but there is something about Nexus devices that really interests me and given the great price of the Nexus 4, I may switch. One thing that I'm uncertain on is how google would handle any problems with the phone, anything requiring repair or warrenty replacement? Clearly they have no stores to go to, do they do doorstep swaps or do you have to send it back then wait a week to get a replacement? With my S3 being on contract I know I can take it to the network if anything goes wrong, maybe even get a courtesy phone while its fixed, and thats something I'd be a little worried about loosing if I went Nexus. Spent too long in the cushy apple world I think!