Also, price / compliance ratios don't really mean much on a rescue inhaler. If you need it, you use it or not breathe - price isn't part of the "should I puff now" decision loop. Other than perhaps not having an inhaler when its need is critical.
Also, the force of the new propellant is way less than the current CFC propellant. A fairly significant data point when the mission is to get the drug as far as possible down the constricted airway. But hey, we're saving the planet, right? Killing off a few asthmatics is a nice way to eliminate their carbon AND CFC footprint.
ping