I had the basic $99 sodastream. We used it a few times and then it just sat in the pantry so I sold it for $20. It was "ok" but, my flavorings expired quickly
I will say this, after I sold it, I wanted another one but, a little bit more expensive one than the basic.
Truth be told, it will end up costing more to have this machine than it is to get a 2 liter of coke.