I'm jumping in here because we are currently in the market for one. Eldest DD has been wanting one for ages. I "discovered" sparkling mineral water last year, and I reckon you could use soda stream in similar ways. Instead of only using their syrups, some fizzy would be nice in spritzers, with citrus slices/mint/berries, and with natural cordials (diluted so they are not crazy-sweet like normal soft drink). So we're getting it for the lifestyle value & not because it is/isn't more Economical.