I may be tempted to move over to the "dark side." CO2 looks light and easy. I don't want to pay $3 per ride, but I have more like 3 flats per year, so I don't mind paying. Do I just bring the inflator and a couple of CO2 cartridges with me? The only downside (other than cost) is that you have a tiny chance of getting a third flat and being unable to continue if you are out of CO2. I think I can live with that risk. Am I missing some hidden problems or risks with CO2?