Hmm ,
I have bought over 200 Stone Pc's over the last 6 years or so and have always found them to be reliable and the cases sturdy if not a bit basic , out of all these machines perhaps I had a call out for about 7 , usually duff ram or a Gphx card but nothing major and it was always sorted next day , also find them good for AV installs , free advice , quotes etc , all in all one of the better companies out there , I have about 10 call me a week , we do this and that bla bla.
I have 1 years warranty on most of them for now , and perhaps just for the sake of something different may try Dell or HP , but can highly recommend them for service and good kit IMHO.