I have been drinking soda stream tonic water, root beer, cola etc etc for years. I love the ease of use, not having to store dozens of cans or bottles, and save on plastic waste (even if it is recycled). I would reccommend it to anyone.
Diet tonic water can sometimes be hard to find in a grocery store. Plus, storage space is a problem. Sodastream's Diet Tonic water is a good way to get your quinine fix for whatever ails you.
I have used Soda Stream diet tonic in the past. This is how i remember it tasting. I thought the shipping charges were very high. If i could find it in a local retail store, i would buy it there to avoid shipping charges.