I had the 5800 for some years andwhen it needed repaired, is where it started.Adcom wanted 450.00 flat rate and over 100 to ship it there and back.As we know you can get a used one on here for that.After telling Adcom that a used was same price there was no help.They did refer me to a repair center that kept it for a month and told me it could be fixed for half that .When i went to talk to repair center they havent even opened boxd..So after that I was done with Adcom. Now for the good news I got the 3500 last month and there isnt any contest the parasound runs circles around the adcom and the guy Tony at parasound is great, so beware if you get the adcom and it breaks. my friend has the 5802 and he isnt happy ...so theres my 2 cents worth