I had a problem with my Markbass 1 x 12" combo which bailed on me during a gig. We ended up getting an Ashdown amp (my old brand) instead, which saved the night. I use the combo for inner city gigs (bars and such) because it fits perfectly well on my bicycle (yes, I live in the Netherlands) and it has a great sound/weight ratio. The shopkeeper from whom I had purchased the amp sent it to a repair guy who changed (welded) some wiring on the printed circuit board, but after a few months the same problem occurred again. Very annoying. The power goes off and on now. It's a bit of a gamble. If it hadn't been for the large amount of money I spent on the amp, I would be looking for a new one, right now. Now I will need to go back to the repair guy and cross my fingers.