E60 is a great choice for 76 keys. and for light 76-er, the only.
for 61 keys and not so demanding keyfeel, there's more options.
the new pa500 seems to be a very appealing alternative, IMO because it offers indeed a better on-fly control.
probably the only serious shortcoming for E60 is the fact you can not get very "wild" while playing, because the whole concept is to use UPGs rather than on-fly controls.
...which for my type of using arrangers is not best suited.
there's not enough buttons on E60 front panel. the ones that are there, are not designed for their best.
of course one could use midi pedal for extra control, but come on! it only takes three buttons to have the orchestrator right there! and is the same with some basic functions that korg and yamaha got it right, with dedicated buttons (left hold, chord/acc memory, fillins, pads, etc)
so, if i was to drop E60, it would be for the lack of some basic functions, and maybe for some of it's sounds. very few that i dont really like.
but right now it's not the case.
probably i'll skip this generation of "cheap" arrangers, and maybe next one will bring everything that's missing right now.

fran, good report!