I just bought one yesterday and here's my review:
First of all, let me state that when it comes to phones I am 100% an Apple guy. I want my portable music device to have all those songs on my iTunes account. I have an iPad (I have 2, actually) and while I think they are fun, they aren't really anything all that special to me. I was going to get the $449 Surface RT package which comes with the touch keypad, but instead I got the $349 RT and then also the $129 keyboard keypad separately which, to me, is well worth the extra $29 - and just let me say that you will really need one of those keypads.... when I first opened the RT and started playing around, before I attached the keypad, it was an infuriating interface. But once I attached the keypad and also my wireless mouse, it made for a very convenient interface.
Now the fact is that I bought the cheapest Surface, so I have 32 GB of memory and it is certainly not the fastest tablet on the market, but I love the fact that it comes with Word, Excel and Powerpoint already installed (which is something you do NOT get with the more expensive Surface Pro). I have already started doing work on my Surface with my spreadsheets.
I'm and Internet Explorer guy so obviously that works well for me with the Surface, but it you are a Safari or Firefox person, you may be a bit disappointed.
Overall, it was well worth the $500 and I anticipate I will be using this far more often than my iPad. When I am travelling I anticipate I will be bringing my phone for my music but the Surface for actual work and web surfing and, finally, will be able to leave the computer at home.