I'll be in the minority here, I have several radios, but none are any more than 4 channels. I used to have an Airtronics 5 channel, but when it crapped out (technical term) I bought a Hitec with mixing (non-computer) for deltas/wflying wings/v-tail.
I'm not into scale to the point where I need retracts, or even flaps, but I do build a lot of experimental delta stuff, hence the radio choice.
I'm happy with my four channels', but there are those that will tell you you aren't living if you don't have a bunch of channels/computer options/ect.
To each his own!