I'm happy with my paxton now, but that was not always the case.
1) Their canned tune is absolutely HORRIBLE ! at least for my car it never worked and they could never do it the right way so something tell's me their tuner sucks !
2) Plastic coolant tank is a POS, overtime it will expand. so i suggest either making your own better unit or buying one from JPC.
Other than that i love it...
If properly tuned the car is literally a monster especially in high RPM.