I'll also vouch for PTF. Jake/Dzenno were very patient and did a great job with my car. Took a total of 12 e-tune iterations to finally dial out all boost overshoot/throttle closures. Now it's pretty close to perfect throttle response and pulls incredibly hard. Put down over 400rwhp and 450lbft on dyno (~100hp/150lbft delta over stock map). $250 USD well spent I reckon.
Steve, is that your wagon on Trademe?
Cheers,
Roman