I'd say they're not bad if what you want is a stable desktop machine you have no intention of playing with yourself. If you're doing Word and Excel and just don't care about games, go for one of their low end systems and enjoy their support. Which is pretty good, as far as computers go.

But if you demand a lot from your system or like to install new hardware or anything, meh. Go with something you know what all's in with no proprietary bits.