Great review Chony

As an extremely happy PA800 owner, I must agree with Steve that there is nothing close to the SONGBOOK feature of the Korg - I'd be lost without it. Live play is so easy.
The Korg fills are not perfect, but they are so over-the-top vs anything else, I happily work around, or just bypass the few trouble areas. And the toggle feature of having an ending/intro repeatedly flash, is such a useful feature.
If Yamaha addresses their drums, it would be a good move. But I don't think that's so easy a task, considering the unbelievable instruments and imaginative nuances that make up a style in the 800. It's not just about the lively drums.
However, I still get nervous about the whole save/load concept in the Korg, but hear it might be addressed with the new OS forthcoming.