I'm posting this from my Surface RT (on an airplane no less).
When I first got my Surface RT, I really liked the hardware but the software was in a terrible state.
Now, 9 months later, I am happy to report that Microsoft has so improved Surface RT that if I bought a Surface RT today and compared it to what I had back last Fall I would think it was a "Surface RT 2".
So what's changed?
First off, it's much faster. Gone is the lag when I was typing or launching things. It's just plain snappy.
Secondly, SKyDrive is much much better integrated in. When I first got the Surface, the Skydrive integration into Office was so woefully slow and unreliable that it was largely useless. That isn't to say SkyDrive is perfect, it still should integrated into explorer as if it were...you know...a DRIVE except where the data is stored in the sky.
Office RT has steadily improved as well and so have the other Microsoft related apps. I still detest the Sype RT user interface but that isn't Surface RT's problem.
Plane is getting ready to land. Cheers!