So I've used the Surface all week long at work, carrying it everywhere I go, using it in meetings and to type up a lot of reports. I've used Word and saved everything to the SkyDrive, and attached docs to emails using the SkyDrive and Mail app in conjunction. I've tied it into my work Exchange server, and have been using the Calendar app.
I have to say it's become a part of my work day so much that I pick it up without thinking about it. I used to carry a Nexus 7 around for the same purpose, but ended up only using it for email/calendar and to occassionally take notes. The Surface, on the other hand, is basically like hauling around a very light laptop, and it just plain rocks. I've only charged it twice during this whole time, battery life has been very good (I keep the brightness at about 60%).
I've mostly used the Touch Cover while on a table in meeting rooms, but have occasionally used it on my lap, and it works great. As someone above mentioned, the left-shift key is the only thing I have issues hitting, and I'm getting used to compensating for it without thinking.
All in all, I love this little device.
Oh, and the sound output to my Denon D2000's sounds great. It won't replace my normal desk rig (Amazon Cloud -> Laptop -> AudioQuest DragonFly -> Denon D2000), but it's very nice indeed.
Complaints: The Windows symbol has all but worn off the back of the thing. Really sucks
