About Ampeg reliability- I think a well built one is quite durable. I've heard there are QC issues with newer units. But I have seen an older SVT fridge/head fall over onstage, the head hit the floor and bounced down a flight of stairs. The wooden case was cracked and bent, the cable ends were snapped off, a couple of broken knobs, but it still worked fine. Dude played the rest of the night with new cables, no problem.