i dont own one but one was in for minor cosmetic repair. this guy had owned it for a solid 2 years and that was the only repair done on it so they're great amps. FYI: dont play it in a rack unless its well ventilated because it breaths from the sides and melts itself otherwise.
the ampeg micro heads are loud!!! the fender rumble stuff sounds toneless to me. but the ampeg svt 3 pro, back when slm owned ampeg which was before 2005, are the most incredible sounding bass amp for a rather cheap budget!
the 66 ampeg b-15 IS the ampeg tone... all the '62s ive played are fatter sounding than the '57 but i preffer the '57 for some odd reason, but hey i play a '51 so whats it matter.