Real old school but so easy to use. You don't need a tuner, just a sympathetic rolling road guy who can do a few runs while you find the map that works best. You need the gcc that works with it for fine tuning after you find the right map for your setup.
I managed to use up to 370 injectors with mine and was able to take out enough fuel low down. Made 262 hp on a td04 forged engine.