We love ours. My kids who won’t drink water have at least stopped drinking juice and sugared soda and have switched to seltzer. If you have a big family- consider a model that uses the bigger balloons. Otherwise you’ll be swapping balloons very often. The syrups are all (as far as I know) under the OU. Oh- and the bottles if you need extra are much cheaper in Israel.
We’ve had a SodaStream for over 5 years. Just had to replace the original. If you go through A LOT of seltzer, make sure you get a machine that can handle the 130L CO2 canisters.