I have a micro 550 in great shape.
The micro trim pots on the top of the amp to set your gain spin a full 360 degrees. I don't think they are suppose to do that but I have found that to be a non issue. I contacted EA about fixing them and of coarse they said no problem.
Once you set these trim pots for your bass you really never have to mess with them again. It's not something you mess with on a gig although you certainly could. So unless you swap basses out alot you will probably never touch them again once you set them for your bass. I did not send the amp to EA for repair because like I said it really is a non issue.
I have channel one set for a passive p-bass and channel 2 set for my upright. I also had a active bass that I would just turn the gain knob down instead of adjusting the trim pots.
Amp comes with the manuel, di breakout and a acoustic image bag in fair condition ( it has a small rip on the front pocket).
Asking $450 shipped in the U.S.
http://www.gollihurmusic.com/product...AMPLIFIER.html