Neil,
I did not know I had a choice in ECU's, and could not tell you specifically that there is anything wrong with the standard unit.
But per e-mails recently back and forth with Dynatek's Thomas Hank, I discovered that they have an upgraded ECU available, and as I posted above the guy making the wiring harnesses for Dynatek said he could make the harness for a FAST ECU if I wanted it.
The only reason I bring it up is that someone here might like one brand ECU over another, and I do not believe Dynatek cares if you want "Brand-X" ECU.
Food for thought
Eric