I've been a student at Surrey for almost two months now (posting from Twyford Court!), and I can say from experience that a few bits of information I was told by the internet aren't true now that I'm here. Firstly, Surrey University isn't posh, and I haven't got that impression from the town centre either (apart from the high prices).
The atmosphere is great as it's a small green campus that has a nice cathedral overlooking it, and I think it's one of those universities that can almost instantly feel welcoming and homely. Plus, if you do somehow get bored of Guildford, London isn't far away at all.
Obviously the league table positions vary on subject, but in almost every case Surrey University is a good ranking university and one that you can put on your CV with at least a little pride (perhaps not as much so as more prestigious universities, but it's still regarded as a good university as it places emphasis on practical industry experience which I have found is almost pivotal in competition for jobs).
Thinking about it, after you leave Surrey University you'll have a well regarded degree, a good job and relevant work experience. I would recommend this university.