Moreover Sodastream also offers syrup in many flavors (also available here). This taste really good and I can only recommend (Orange comes eg. Very strong at the Fanta flavor zoom).
Caution: Important, however, the water taste out of line. Water may taste very different. That's why I recommend before buying aware the water "taste" to. We used a similar device not used because the water from the tap was not good.
I addition to filter the water before with a Britta water filter that changes the taste of the water so that it tastes like Volvic.