Here's my fundamental list of gripes with the JVM:
In 2007 I bought one of the first JVM 410H heads for $1600 out the door, which was going price back then. Suddenly, when the 2-channel models were introduced, instead of being $1100-$1200, which would have been about right, Marshall slid the whole pricing structure up, making the 2-channel versions occupy the $1400-$1600 range, and made MAP on the 410H something like $2299.00. So without any differences, overnight a $1600 410H costs $2299? WTF? That's just cheating.
After using my 410H for a while, I found that my 12-channel head was really only a three-channel head: Clean/Green, Crunch/Orange, and OD1/Orange. Every other channel/mode was unusable/sounded like ass.
If they're SUCH great amps, why have they depreciated so poorly? You can now get a 410H for less than 1/2 of MAP on the used market. The 2-channel equivalents haven't dropped that much. Could it be because the JVM410H simply is NOT a $2300 amp?
YMMV,