Bruce,
Analog or ECU there is always a learning curve and if your doing it like at the level of Stan or Danny then why move out of that environment, you know that system well.
Moving to an ECU for me is learning another kettle of fish. When the system gives you an engine light or it may NOT and you have to trace down a symptom and the ECU is not really telling you much it can drive you crazy just as much. ECU's are not necessarily adjusted for each car made in a model year. So you can end up requiring minor adjustments while the ECU is reading within range. The usual dealer set up is to start changing modules. (when you get to $1500 in new parts you hope it works, MAF, EGR, Air Fuel mixture, sometimes O2 as well )
In the case of an engine even with stock ECU in a speedster you may or may not have the air intake pipe the same with a K&N, it could also be a different diameter for airflow for the MAF sensor then other sensors may not be there etc.
Not to mention the headers and exhaust being custom may again give you different Air Fuel readings. All of sudden your running lean or rich.
All this to say you may require an Ecutek program to tune a stock ECU from Subaru and/or you might goto another ECU like a Stinger or Atom and your tuning it again at least in the initial set up.
Conclusion, pick your poison or medicine and I'll dispense with anymore talk, for now about my journey in the ECU world.