Why would you buy such a device? The $599 version costs just as much as the cheapest Mac Mini, but:
- 40 GB hard drive vs Mac Minis 60 GB
- 1.46 GHz Celeron vs 1.66 GHz Core Duo in Mac Mini (huge huge difference!)
Why would you buy that over the Mac Mini? You get inferior specs, lose the ability to run OS X and all its applications. It looks aesthetically worse than the mac Mini too, but that's rather subjective. Since the Intel switch, you can run Windows and Linux pretty painlessly on the Mac Mini too.
Why would you want to buy such a machine?