Summary: I tried installing 64-bit Win7 Home Premiere on this, but afterwards it was VERY slow. So slow that Task Manager was taking like 30% of the CPU (that's 60% of one core!) just by looking at it. I decided to try and install 32-bit Win7 and that went much better. I guess I don't really need 64-bit Windows on this anyway.
Pros: Tiny, palm-size, nice fit-and-finish, easy to install HD and RAM.
Cons: It's really weird to install an OS on this thing because it only has 2 USB 2.0 ports and the other 2 USB ports (3.0) aren't available until you install the drivers in Windows. So, you have a USB DVD-Drive taking up one USB, and you're left with one port for a keyboard or mouse. Unless you have a combo mouse-keyboard that uses a single USB port, you'll need to swap your keyboard and mouse around as needed until you get all the drivers installed, not fun.