If you were a child of the 80s, then SodaStream is probably firmly lodged in your subconscious. You either wanted one, or weren't allowed to use it, or in your haste to get to the fizz, forgot to install the water bottle properly and sprayed your kitchen, much to your parent's annoyance.
Variety of flavours; easy to use; kids will go mad; flavours are pretty good
Bottles not dishwasher friendly; no way of trying before you buy - if the flavours don't work for you; you'll never use it