I just picked up a JP-2C yesterday. It's a killer, killer amp. I have plenty of high end heads (including a Wizard MC II) but this one just blew me away. Amazing cleans and the overdrive just has that mean, aggressive tone with perfect mids. I grew up on mid-to-early Metallica so maybe that's why I like it so much. And it's way more versatile than I ever expected it to be.
Surprises me to see so many of the JP's up for sale. I wonder if guys just don't take the time to dial them in...