I have the $150 emachines from 2 years ago (BF '05). I had to leave the computer on from late Dec '05 all the way to early October '06 (don't ask me why, far too long of a story, let's just say it involves a MMORPG) all I did was reboot every 2 or 3 weeks and only because that was about the time it took it to start getting slow.
Anyway, the computer is still working flawlessly and, if it weren't for the fact that my hard drive is excessively saturated, I would be able to say that it runs as good as new. I have truly abused this computer and yet the only thing that shows any actual wear is the mouse, and only because the paint came off were the thumb and index finger are supposed to go, but seriously after 2 years, it is perfectly understandable.
So I don't know about everyone else, but I completely recommend them.