There are lots of great reliable tube amps out there. In the past 10 or so years I've had Berning, Atma=sphere, Lectron, RAM, Joule and VAC. I've never had a catastrophic failure. One time, one of the big Russian MIG tubes "ran away" on my Joule which was scary but after shutting it down and replacing the output tube, the amp was unscathed. I must say that some of the ARC amp layouts I've seen w the tubes installed horizontally, and stacked one over the other, seem to me to be "asking" for problems w heat-related failures. As far as a manufacturer that says their amps are not warrantied unless you use their pre-amp, I say fuggedabowdit. I say-let 'em sell integrateds.