Has anybody owned an SWR Mo Bass for any lenght of time? I am interested in the reliability of the unit first and foremost. There has been a lot of discussion about the "wobbly" pots. Has this led to any reliabilty problems? I am interested in buying one of these units but am a little put off by the reliability issue. I am also wondering from those long term Mo bass users if the FX are more than just novelty. Are they genuinely useful? Finally I am interested in hearing if there are any other pitfalls or problems in owning one of these unusual and creative amp heads?