I got it with Dreamspark two days ago, and so far, I don;t have a problem with it.
On my laptop (older Dell D430) it is faster than 7 by quite a bit, and makes the laptop much easier to use.
On my desktop, there is a noticeable speed increase over XP, but the XP install was three years old so that might have something to do with it.
The only problem I have is screwing with apps, I always forget how to close them properly...the video app for example. Sometimes a little bar on the left opens up and shows my (running)? apps....but I can only ever bring it back on a fluke.
I feel like an idiot, but the OS is fine for what I nee.d