locks you more into the proprietary / DRM-laden WMA/WMV file format
crashes twice as often as standards windows XP
doesn't work with those "supposedly protected" CDs that try to hack your system (such as the spiderman DVD, that tries to muck with the system's boot sector)
costs a bundle,
not normally available in stores, except with one of those new pcs with integrated kitchen sink
also, requires at least a P4 2.8GHz to run at reasonable speeds
and more importantly, here in France, people buying said PCs are forced to register for the Tv license tax...
Thanks, but no thanks, I will keep my linux based system, that does the same thing in a mini-epia, at about 1/4 of the cost, plus none of the headaches.