What's the advantage of the ECU EDITOR over a microtech besides being cheap?
It is certainly less cost, but also, less on the bike (injectors, fuel rail, extra fuel lines, secondary computer, etc). If you are building from scratch, it is likely the way to go. If you already have a working secondary setup, probably not going to see any differences to go to internal.
Current downside is the limit on boost being that of a 3 bar sensor. The groundwork for a 5 bar sensor option is on place, just not implemented into the code. Also, tuning can be a long process as it is not able to be done without powering down and re-flashing, rather than reflashing on the fly.