My father-in law has one and he was happy as punch!

If you know someone who has one, see if you can borrow it for a bit and see how much you use it / save on soft drinks and cordials.

I think Soda Stream drinks have all the health problems of regular soft drinks – sugar, salts, acids, colourings etc. – that destroy health. The only possible advantage that I can see is that you might be able to make just carbonated water (no sugar or salt or acids or colours or flavoufs) and if the kids/hubby get to like this there are less health hazards than with the additives http://www.healthline.com/health/food-nutrition/is-carbonated-water-bad-for-you#3

Yes! I definitely think so. I bought one second hand off a buy and sell page for $10 and we have had it for about 12 months now!
We just use it without the flavorings in it, i don’t think they are necessary at all.
It is about $20 for one of the gas bottles, and we are not big huge users of it, probably one bottle of water gassed up a day, we have only been through one gas can!
Definitely go for it, i say yes anyway.