Sorry to hear that your chipping experience did not work out. Just my 2 cents, I am very pleased with the chip I got for my 2.7L 2000 Boxster. I got my chip from the folks at Autothority Pitstop, who were very helpful dialing it in for my car.
The main thing I noticed after chipping was how much more responsive the car is at low to medium rpms, which can be seen by the very flat torque curve. I would recommend it to anyone that wanted a few extra hp (I get a little over 200 hp to the wheels) but a noticably more responsive car.
Ed
