I have one as well and its really not about the cost savings in my opinion. When you factor in all the costs including the carbonation and filtering your own water (something like a Brita) you are not really saving a ton of money. However, the ease of making a soda when you want it is great, and I know I drink way less pop now becuase of the 'annoying factor'. If there is a can of pop in the fridge I'd just crack it open, but if I have to take a few minutes to make my own, I might just have a glass of milk instead.
It's all about those intangible benefits for me at least.
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