My kids like yogurt. They also like to eat things without utensils, so tubes of yogurt are good. I try to buy organic usually (like Stonyfield Farms), but I can't always find that brand in the store.
When I saw the Yoplait Fizzix, I was with my sister. "Hmmmm," I said "fizzy yogurt? Do you think it's like mixing pop rocks with the yogurt? That might be good." My sister and I both love pop rocks. I figured it was worth a few bucks to try something new that the boys might think was fun. My sister didn't want to try any because she was allergic to the flavoring.
The boys gamely tried it during morning snack time the next day. And promptly spit it back out and threw the tubes in the trash. Even N, who eats pretty much anything, told me it was "very, very bad in his mouth."
Of course, I had to try it myself! And while it wasn't horrible, it was definitely strange. The carbonation isn't as strong as if pop rocks were mixed in, but you can definitely feel the carbonation on your tongue. Mixed with creamy yogurt it was very odd. Odd enough that I pitched the entire box into the trash. I might have eaten more, just to get my money's worth out of the purchase, but the yogurt itself was way too sweet.
Hopefully I'll help you save a few bucks in case you were curious like I was. Spend it on chocolate instead! I wish I had.