I'm not a big fan of touch screens. I have big fingers. But no deal breaker.
I REALLY miss dedicated buttons for the vocal and harmony settings on S900. Instead you have to go through three screens. Oh and to adjust the mic input, get up, walk around, get out your flashlight and turn a little knob.
E50 has some similar drawbacks, such as having to open a screen for the transposer, no dedicated fade-in/out without programming, no break/fills, little bitty touch screen for octave up and down, etc.
So far nothing is perfect.
Regarding the positioning of the style control buttons on Audya. For me they should be on the left. I asked AJ about this, and he said they wanted to put them on the left, but that would mean putting sliders in the middle. They would have to compromise the length of the sliders' throw to do that, or make the entire case bigger.
He explained it better but that's the gist of it. The Audya does incorporate many ways to change variations, use fills, breaks intros and ending without touching the buttons. You can do it with footswitchs, pedals, dynamic touch, etc.
Probably the layout thing I liked least about the Audya was the positioning of the BP and Mod wheels. I use them a LOT, and there is obviously a pretty good reach involved, as opposed to merely lifting your fingers an inch.
Nothing is perfect.
DonM