Bernie, I am happy to see you move towards a software based arranger system....you will never look back. You will be very surprised at the very high quality of the sound and flexibility of such a system. Yes there are drawbacks....large learning curve....control surface not as good. This is all outweighted by the high quality sound, especially the emulation of acoustic instruments. No hardware based system comes anywhere close to these sounds. Talk about super articulation voices (SAV)....well I have used such voices for years....it is called keyswitching in my software world, e.g., keyswitching from growl to breathy sax, up bow down bow violin and so on.
There will be times where you will through up your hands and say why did I do this but if you stay with it you will be rewarded big time.