George -
Thanks ever so much for sharing a perspective on why different functional characteristics of the manufacturers makes it impossible to have a one shoe fits all approach to these kb's. For myself and what I have seen of GEM - WK products -I like their sequencing enough to wait the release of Genesys to see if their sounds are going to be improved. For my music - the intertwining of sequenced rubato sections and full on live arranger sections during one song is important. I am trying to rate my arranger choice on the following:
1. ease of live use (variation, fill,)
2. ease of toggling between song and style
3. quick access to song data base
4. weight around 30 pounds
5. lushness and fullness of strings and pads
6. sequencer simplicity
7. wide variety of jazz percussion styles
8. video out/notation software interface

thanks for sharing
Mike H