I've owned the 4S for about 5 months now and I've been very impressed, I was a bit hesitant about buying the device as I would have to go down the sim-free route (My current contract doesn't end until June 2012). However, in the end I decided I had to get it, so I did. I didn't think it would be much of an upgrade from my iPhone 4, I'd had iOS 5 (beta) for a few months and was very impressed, however, this meant I had already been using most of the features for about 4 months, they were getting a bit boring already. Anyway, back to the point. When I received my 4S and started using it I was blown away by just how, much better it had gotten, it immediately seemed as though the only thing that had stayed the same was the design, it was amazing. Then came along the battery life, yep, that had changed. I noticed it was lasting about 1-1.5 hours less than my iPhone 4, over time things have got better and I'm getting about 6 hours of usage and 12 hours of stand by, so that's n ot really a problem now. (Also, most places have a USB slot you can borrow). I could go in to loads of detail, but I can't be bothered, let's just say I would totally recommend getting this device!