Runonce: not feature set in particular (other than 4 channel + timecode). The main thing is that I own the R-4 Pro vs selling it and buying a different recorder. Right now, I believe that only the 788T has SSDs. That may change after NAB. I'd go for an Oade-mod, but that puts me back to square one with buying a new unit from Oade. BTW, I spoke with the techs at Roland about the SSD conversion. They basically said that they would be very interested to know if it worked. <sigh>