We have deployed a few dozen of these units at my work.  The oldest ones have been in operation for almost two years.  So far we have not had a single hardware failure.  our computers run eight hours a day or more seven days a week.  Our sites only shutdown on holidays so our computers get few days off.  These are a first rate business class computer that I highly recommend.  They may not be flashy like a game optimized unit, but if you need a reliable business class PC you will not be disappointed.