When apr release serial port tuning it'll be a topic. Until then it's just hearsay (crap band who won some TV program)
Basicly ECMS, good product, had it, impressed by it, but IMHO my current chip is better. Best 1/4 I ran with APR was 14.9. With same mods, but a different chip I ran 14.22. I can't mention my current chip though!