Ian all good points variations & styles DO NOT fit into what the kids are listening to today ....why?.....because they were NOT produced on an arranger keyboard!!! so how to you reproduce it with repetitiousness style variations, tempo changes, rap & hiphop beats, etc, etc, .....but if the player was able to EASILY make style tracks customized to a certain song the way they like there might be a chance... then again I would assume many just want the easy way out and have the manufacturer dictate what you will play and how your music sounds......funny thing is they know this and know how to manipulate the public keep them separated in two camps and beyond which increases sales.....MORE CHOICES means MORE MONEY IN THEIR POCKET......the New Motif XF almost has it right....just please include full style creation also & you would have a killer arranger/workstation KB. Now that's what people should be complaining about and writing their letters too...plus they are so much less money then a TOTL arranger?
http://www.youtube.com/watch?v=F8A6cvkoyH0&feature=channel

watch this XF demo from 11:00 this is what our styles should sound like.