I've got 5 planes programmed on my 9C and its great. All models are stored with a name, not just a model number so picking the right model is simple. I would never want to have multiple transmitters.

My CAP uses 6 channels and multiple mixes and my Ustik 1.20 use 7 channels and a kajillion mixes. Even my goofy little Electrajet uses a delta wing mix.