Summary: 1. The one I got completely died after about 5 days. When I say dead, I mean like paper-weight dead. I probably got a bad one from the start, maybe these other cons are related.
Pros: Size. The pictures make it look small, but it is just plain tiny. Runs Windows 7 fine - forget anything else (see other thoughts). The processor performed better than expected, it exceeded the performance of an Atom 330.
Pros: Nano x2 absolutely destroys Atom dual-core, by far the fastest embedded processor on the market. Super low power consumption, plenty good for what it's supposed to do, give you a small quiet low power system. Good for light web browsing and some flash games, also pretty good for retro gaming. Half-Life runs great! Tossed 4gb of RAM and a 120gb Corsair Force 3 SSD in.
Cons: The VX900H IGP. While the processor blows the Atom away, the graphics are humbled even by Intel HD 2000, let alone the nVidia ION and ION 2 on more high end Atom systems.