I would audition a Roland E60/50 (preferably the '60). The drums on those things is a definite notch up from Yamaha arrangers, especially if you want to get out live with a trio. They are punchy and dynamic enough to survive three live players on top of it, something I don't feel Yamaha's do as well...

If your brother wants to yell out random styles at random tempi in the middle of something else, I wouldn't touch a WS with a barge-pole. That just isn't their strength. Stick to arrangers, or be prepared to put in a LOT of work in advance, and STILL not have the stuff a regular arranger can do.

[This message has been edited by Diki (edited 02-19-2008).]