My roommate brought these straws home one day, and I never tried them before. They just seemed like a gimmick to me. If I wanted flavored milk, I'd get stuff to make real flavored milk. Anyway, my point is... These straws are weird. The straws are filled with flavored balls and you suck the milk up through them. The problem is, the flavor doesn't transfer to the milk. By the time you get to the bottom of the glass, that is when you get some flavor. The part of the straw that is submerged in the milk, those flavor balls have dissolved and flavored the milk.
The whole idea of getting flavored milk through the straw sounds like it would be a neat idea, but it's not. Just go and get some powdered flavoring.
I was a little disappointed that the straws don't live up to their claim. It would be pretty cool to break out a straw and have flavored milk for the same price as the plain milk. But, then again, that's just my opinion.