With the caveat that all of this falls into the category of first world problems... Regarding the economics, as someone with a serious diet coke addiction, the

With the caveat that all of this falls into the category of first world problems... Regarding the economics, as someone with a serious diet coke addiction, the SodaStream has been a godsend. My first step in getting off diet coke: switching to seltzer water. But seltzer still costs roughly 1$ / 2 liter bottle (and I usually see it for 1.19 here), or at least .50/liter, whereas the sodastream is estimated to be ~.30/liter. I drink at least 1 liter / day, 2-3 on weekends, which means .20-.60 saved/day, or ~70-220/year saved. Plus, you always have it when you need it, and you don't have to lug around water bottles from the store. I wouldn't recommend it for the actual soda flavors, however, or if you don't use it very often. But if you have a problem like I do, it's well worth it, and pays for itself fairly quickly. But mostly I like avoiding the vast amounts of plastic waste I'd otherwise be generating.