The good: It makes sound like it should.
The bad: It feels cheap, especially the lid. It should have had some form of spill resistance, whether a better sipping lid or a straw lid. The part where you put your mouth to drink is uncomfortable and invites drips. I can't imagine they did much testing with this design prior to release.
These load cups are the bomb and hockey games and were a hit this new years party . if you don't have one order it now !!!!