I ordered the PPK from the same BMW dealership for $450. I had it installed along with the BMW PE. The added hp/tq is nice and like you, I have extended warranty and don't feel like installing/removing a tune whenever it has to be serviced. I don't plan on doing any street racing or track days so it works for me. I bought the car because I wanted a convertible, not a race car. Now a used 335i e92 would be a nice track car, IMHO.
After 6yrs/100k miles, I may look into aftermarket tuning.
2007 Dodge Charger SRT8 "SuperBee"
2012 Dodge Charger SRT8 (Wife's Car)
2011 BMW 335i/E93: M-Sport, PPK1, BMW PE, Black Kidney Grills