I'm sticking with my recommendation on the Katana, but just want to say I made little progress today trying to mix out what little coupling there is, 'cuz the stock linkage is a bit sloppy. I shudda known that. I'd mix it so it was good on one flight, then it would be too much or too little on the next flight. Got lots of practice pushing buttons. The peanut gallery liked it though. They thought I was showing off.