Having owned a PSR2000 and now a G70, I would say the Yamaha styles are more animated with the backing parts making their sounds evident. The Roland styles seem more subtle and life-like. By that I mean the backround sounds are not so in-your-face but are there to support the drums and bass more than to stand out on their own -
IMO -.

If you've never (or hardly ever) played Roland styles, you'll be very pleased with some (traditional dance styles especially) and won't find enough to satisfy in others. The dynamic arranger option does offer some great user input.

In retrospect I miss some of the Yamaha styles, but when I hear them on recordings they sound thinner and more artificial than the Roland - IMO.

I think back to my old Korg iX300 and I felt then that those styles were way out front and very song specific. Except for a few that I just had to save (and still use) the Yamaha 2k styles were a vast improvement. Are the Roland styles a similar jump over the Yammies? Yes and no. I think the Roland styles sound so much better than the Yamaha, but if you are a long time Yamaha user you may pull out what hair you have left on your head playing with the Roland OS to fine tune your styles.

Hope this makes sense.

BTW, if you get interested in a G70 I still have mine and it's always for sale.

[This message has been edited by cassp (edited 09-12-2007).]