I do know two people who have had JCM900 and both loved them. One of those people used one (or 2 JCMs) as their principle amp(s) during a couple of world tours, so yes they can take plenty of punishment !
I totally go with try before you buy !
My instructors page and www.studiotrax.net for all things recording.
my toons Brought to you by Dr BadGAS
my toons Brought to you by Dr BadGAS