Been using Surface for a week and love it.
The build quality is awesome. You can tell the Surface team obsessed over every part of the design from VaporMG to the tapered edges and the built-in kickstand.
Don't think MS is getting the credit they deserve for the Touch Cover. It's genius and if another company had thought of it, it would be praised a hell of a lot more.
Windows RT isn't as bad as I thought. My main concern was that I couldn't use Photoshop or my FTP client. Instead I winded up using Paint for very basic resizing and format changing and FTP I don't necessarily need on a day-to-day basis. The RT was never ment to be a laptop replacement, but with Office built-in, USB, and mini HDMI it is damn close.
Love the Metro interface. Live tiles, super clean interface. Yes, the store could use more apps, but for launch there is a decent number of the most used optimized for Metro. There are some software glitches, but none major. It's speedy all around, but for some reason games don't seem to be optimized and lag more than they should.
Didn't know Xbox Music would be this good. You can stream anything and the ads aren't abundant or intrusive. Also, Xbox Smart Glass is actually useful. Beaming back media between Surface and Xbox is simple enough and works without a hitch.
I wasn't happy when they announced launch prices for this thing. But after using it, at $499or even $599 it is very competitively priced in the tablet market, particularly when you can get actual work done on it.