The touch screen is the biggest problem. Too much room for error, if you miss the EXACT spot you are looking to touch. A button is easier to feel. The lack of real time controllers & Buttons is the other problem. I need to access more things than they let me. I also like to start an arrangement with manual bass, and then switch to arranger mode in the middle, then switch back later on (sometimes). This was not possible without using specific performances. Once you go into arranger mode, the manual mode would not remember the bass part.
I want simple On/Off funtions for the main stuff. That's all. I guess I am spoiled by earlier models that gave us more conrol.