Acer makes some of the best prebuilt computers, a friend of mine has had one for a few years now with out any problems at all and got it for fairly cheap.
my school had a whole bunch of prebuild acer's. they were pretty nice. non too fast. but definately pretty good and as other people said, reliable.
personally i wouldnt get one for home. but for a business for sure.
^^ Agree with everyone. Great for the price and their monitors are top notch. Theirs just one but. HP and others have a little better quality but, Acer is still good for the average user.