I think the OP should listen to Ian, and any others offering advice honest advice.
The best way to know the bitter truth about an instrument, is to listen to the competition's views (Korg and/or Yamaha), which will be much more realistic than coming from a total Roland fanboy.
The S910 has Audio to USB recording, incredible sounds (SA/SA2/Mega voices) and excellent and more modern styles.
This is not to get into a p*ssing contest...this is to evaluate an instrument from all sides.
Only fair.
The G-70 is a nice well made instrument, and if the outdated bits (it has a floppy disk drive) don't bother you...go for it.
The price is sure right.
Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.