The 6EXA will allow you to fly pretty much any plane out there that doesn't require more than 6 channels, except planes that you want to set up for some types of "Fun Fly" type functions, or high performance gliders.

In other words, it would be difficult to set up "crow" and "spoilerons", or to program in down elevator with up ailerons if you were also using flaperons.

The 6 EXA WOULD allow you to fly a scale warbird with the standard 4 channels plus flaps and retracts for example.

Hope that helps.
Dennis-