I have one and although its okay, if I had it to do over again I wouldn't buy it.  One of the selling points for the unit is that it has both drums and bass guitar in it.  I thought that would make it a good machine to use in live gigs with a sequencer and my acoustic guitar.  What I didn't find out until the thing drove me crazy for 2 months is that the bass section of the unit doesn't respond to midi contol messages of any type.....volume...bends.....nothing.  It was deliberately built to not respond to them.