I have a BK5 at home.
It is working well with vArranger, but I am not sure why someone who use BK-7M will buy vArranger. Maybe to play Yamaha styles?
Exactly Dan - I can not see why one would need BOTH?? Although vA does give some other really useful live tools, like multiple midi marker points available at the touch of a screen button, chord sequencer, lyrics view, chord entry method, splits, bass modes...and all available on the main work screen..no hidden menus to have to navigate on stage...
And using a BK .ins file vA recalls sounds easily..
Still, it does seem a bit of "overkill" and the need for TWO devices, a laptop/pc and the bk7m.
Dennis