Yamaha DG80-112

I bought this amp about a year ago and had never heard much about "modeling amps" I thought oh well I'll give a try and if I dont like it, I should be able to find someone to sucker into buying it. But after some test and evaluation, this amp in my opinion really rocks. I was wondering if anyone reading this had tried one, and if so what are your thoughts and comments? I payed somewhere around $550-$600 range for it new, and have not had not the first second of problems with it. Has anyone had any problems with theirs?
Thanks for the input,
D.H.