You have to understand that a remapped ecu with guesstimated values will never be as accurate as a dyno tune. With the power that some of us are pushing you need to get it tuned on the dyno, or at least via a system which allows for adjustments. Hence the need for the EMU. the gzone remap will never replace our need for a piggyback. The only thing the GZONE is good for, for those of us who's already tuned with EMU, is the throttle and speed restriction removed. So the gzone remap means no need for the vmanage...I think.
For guys without an EMU it'd be good for other aspects such as afr and what not...