Just how highly you rate it. I want to get a second amp to use in conjunction with my my Marshall JTM60. Basically what I want to do to run the Fender straight from the guitar on cleanish setting, then use my Marshall as my channel switching amp with all my effects. I've never quite been happy with the clean from my Marshall but I really like how it sounds with an O/D pedal.
Ultimately, what I'm looking to do is run my clean sounds a little bit dirtier and my dirty sounds a little bit cleaner. I stole this idea from Gearjoneser, something he said on another thread.
To be honest though, as much as anything else, I just want the pose factor of using two amps on stage, hehe.
Thanks,
Benja