Ah10's list when compared to the R1 though is flawed.
The receiver that comes with the R1 is nice and small and the radio has all those adjustements for the ALB also.
I agree though, most features are the same through out those radios so it comes down to feel.
Personally I think the most important feature is PCM. This feature has already saved my engine and my car once.
P.S. - I have a R1.