I just bought a 1990 last week without even trying it out. I'm running it thru a Carvin 4x12 speaker cab loaded with Carvin 100watt british speakers. As far as reliability I used to own a 6262 head and I have never had a problem with the 6262 my friend who bought it from me about a yr has never had a problem with it and he uses it all the time. As for the 1990 I'm really impressed. As for the tone it is there, the cleans are awesome, the the lead channel has it going on aswell I tried it out in my living room(hardwood floors), my bedroom, my playroom in the basement, out in the garage and outside, my 2 strats, jaguar, and les paul sound great thru this head, it takes pedals thru the front alot better than my Crate Palimino 2x12 combo does what I was really impressed about is when I turned this amp all the way up and played it didnt lose what it had like alot of amps do. The only qualm I have about the amp is the knobs, they coulda picked some better knobs IMO. I've owned a couple Peavey's, a ton of vintage fenders, 2 mesa boogie amps, a marshall 1978 JMP, a JCM 800, a 900, a TSL 100 1x12 combo, a TSL 100 watt head, and b-52 AT-100, and if this amp holds up on the reliabilty end I will defend it. And I will be buying a 1960 head when I see they have 1 in stock LOL!
