Thought you cared about the environment like Sodastream does.
The question really is whether or not cheaper is better than being green? Just a thought. I think many of sodas users are more concerned with being green, after all this isn't the cheapest thing to get into.
Disposable CO2 boost convenience, and thus will reduce emissions drop trucking carbonated sugar water, as well as reducing bottles and cans from landfills.
Disposable propane cylinder is not 2 foot tall, it's 16 oz, about the size of sodastream's canister.