Yeah, that, I totally forgot to mention the centering/trim thing. If you have a plane that's been flown, then if you set up the buddy box that way, the plane will be nicely in trim. If it's a new plane, you will often benifit from a trim flight, then set up the buddy box.

However, you don't necessarily need to have the end points be the same.

My wife and I fly together a lot, we have my 9303 and her dx7 set up to buddy box a number of our planes, including my 50cc Extra, an electric GeeBee model Y, a Dragon Lady, and several others. We use slightly different setups on some of the planes, sometimes due to the radio (I have throttle curve on the 50cc gasser, she doesn't because the dx7 can't do that, instead I fake it with the subtrim), and the mixes are totally different as well. On the Dragon Lady, she likes a faster rolling rate than I do, but I have more elevator and less expo than she does because we like different elevator feels.

I also have another computer radio that I use with my 9303 on my LT-40 for intro flights and such. The buddy box (an old JR x347) is set up with more expo and less throw than what I have. I have enough throw on the LT-40 to do flat spins and all kinds of fun slips, flat turns, and other stupid trainer tricks, the x347, not so much, it's much more trainer-like.

So, you can use the fact that the buddy box and master TX use their own programming to good effect if you want, I do. Lots of fun.