I used a Korg AX3000B when in a Muse tribute band and I found it very easy to use. Some of the pre-programed sounds were very useful, some not as much, but it's quite easy to tweak and alter the pre-programed sounds. However, my only critisism was that the only way to bypass the unit was to go into "tuner" mode. There may be a true bypass mode but after 2 years of using it I hadn't discovered it!