I saw my old thread and I did buy one, back in 2017 during Cyber Week. I use mine a LOT. I absolutely love it. I love that I can carbonate my own water, not drink mystery carbonated water from whatever muncipal water system where a factory is located, my carbonated water isn't sitting in aluminum cans for who knows how long before I drink it, and it just plain tastes fresher. Plus, less waste and less to carry home from the grocery store.
There is a way to buy the large,restaurant cans of CO2 and fit them to a Soda Stream. My dh said he'd do it. It's been 2 years so I don't think he will.