I've read about some guys having low speed drivability/throttle modulation issues, whereas some others say their's feel just like stock...simply by using a canned tune (i.e. Delicious).
So I went down to see a local sprintex installer/tuner (renowned subaru specialist) chatted a long time but he pretty much said it can't be totally eliminated. According to him they can smoothen but it'll always be there. I always thought a dyno tune would be best. So I left there slightly confused and not feeling very confident about using them
Going to speak to another tuner tomorrow. Plan is to bet boosted before xmas