Not a "holy war", but I have certainly used the Edirol's built-in mics successfully to record classical performances. They have done particularly well in very live acoustics.
I haven't heard/used the Zoom, so can't comment how it compares, but I definitely like the Edirol better than some of the cheaper external mics available. CLeaner, warmer sound. Good external mics will probably give better results. But the internal mics certainly can do a lot for you, and IMO are WAY better than something like the Sony 907 that many people start with. I'd definitely rec an R09 using internal over an MD using the Sony.