Got mine last week at the launch here in HK. Really is a very, very nice piece of kit.
Definitely fits in it's own niche right right now. The touch keyboard is excellent, and the touch wedge mouse I got as a freebie. Really does work nicely as a tablet, then just flip out the kickstand and you have a usable keyboard, mouse, screen setup, with i5 grunt running Lightroom, eclipse, even some games like xcom, Portal etc. Digitiser pen works great.
Very very nicely engineered, feels as good if not better than apple kit in the hand. Touch keyboard attaches very securely......one thing that really impresses me is the power supply, it's made of the same magnesium alloy as the surface itself, and IT HAS A USB SOCKET ON IT! Why does everybody not do this? One socket for your tablet/laptop and mobile charger (plus another one if you use the USB3 port on the surface).