I might add that, by the $1700 S900's standards, these are actually VERY good keybeds in the $900 GW-8.
The GW-8 does not have the drum micro editing of the E/G series, so moving drum sounds around is a bit more tricky. It would have to be done in the Style Editor/Composer, rather than the Makeup Tools. But, while I had a GW-8 (on loan), it played several G70 styles with little problem... nothing that the new OS2 can't correct, that's for sure.
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An arranger is just a tool. What matters is what you build with it..!