the ecu reads your maf and builds its own table. if you drive in this mode long enough it works fine when you ditch the MAFs with slight tweaking. I have tried map ecu and it was cool for a while but there simply isn't a market for it in the z community. People looked at me funny when i talked about it.
Another thing is that it needs to be tuned car and mod specific. breathing mod changes have a significant impact on it. That and severe weather changes require adjustment. IMO its a cool step towards a standalone. Most people looking at it will eventually end up with a standalone ecu.