anyone got an opinion on the JCM 900?

[professorrock]

Im thinking of buying a JCM 900 4100 (twin channel etc) sometime in the near future. They look like the best amp for me, I play progressive rock with some metal. I'd be getting it second hand of course, as i'm not a millionaire! lol. so i was just wondering if anyone had opinions on the amp, in terms of tone, reliability etc. thanks for the help.
-Chris

[SpooN]

They are pretty sweet, for that real metal crunch you might struggle depending on what guitar you use.