These threads always stir the pot, both sides have die hard devotees.

I've had a kit on my truck close to a year, I've put 4 bottles through it. It never see's the track, just screwing around in Mexico. If that's your situation too, N2O is the better cheaper route. However, using it all the time, it adds up QUICK. And after having it, the novelty kinda wore off (mainly cuz i pay 80-100 to fill the bottle).

Moral of the story my trucks seeing a D1 in it's future.