So, as someone who does not own a 722/744, this is straight up question. Please do not take offense, as none is meant by it.
I thought the 7xx series was designed for the purpose of being a true all-in-one box. By this I mean superior grade pre-amps and ADCs, not to mention all the bells and whistles (e.g. kick-ass meters etc.). I could not come up with any other reason why someone would pay $2200 for a recorder.
If that is true, why in the world are people running other boxes (V2/3, Sax, etc.) in front of them? Does the sound improve that much with a pre-amp? Especially with something like a Grace box, the transparency certainly isn't adding anything. If so, why would someone not spend HALF the money for something like a Marantz? As an R4 owner, I know why I spent $1100...mostly for a 4-channel, light weight, HD recorder, but I can't see spending TWICE that for something with 2 less channels, and behind the same boxes.
I obviously have no idea, since I don't own one, but what am I missing here?