Anyone yet purchased the new CH throttle quadrant USB? I was at the CH site today and couldn't figure out what the difference was between the the quadrant for the dual engine and the multi engine...?

I don't think that there is a difference! With the package you get extra knobs and using them you can configure the throttle for 1-4 engines.I tried the throttle at Oshkosh and it felt OK. It certainly didn't make me drool but if that was what I wanted, I would get a throttle from simavionics instead.