I love it!!! We got the Yves Behar-designed model (very sleek) and it's something you can leave on the counter or stow away; it doesn't have to be near an outlet to work, since it's just the little carbonating tank doing the work. I like plain sparkling water with a little squirt of lemon or lime juice, and this makes bottles of it for me in seconds.
Duke can't wait to experiment and make things like mint ginger ale. I'm just glad we aren't wasting as much! I don't think Sodastream really saves you that much money or anything, but sparkling water with a hint of flavor truly gets me to drink more and stay hydrated. So I think it's worth it just in that regard.