Hi- if you or anyone else reading this thread gets the chance to use the internal mics I'd be very interested to hear the reports!
I do a lot of recording using the internal mics of my Edirol R-09, and have been less than happy with them. I suppose them being omni mics contributes to what sounds like an indistinct sound field, somewhat hollow, when recording gigs, rehearsals, etc.
Using just the internal mics, I'd love to have a recorder that captured a sound that was very close to being there, and I'm at least imagining that having both omni and condenser mics to blend to taste in a DAW would bring a good combination of direct and ambient sound.