We had Slush Mugs when I was a kid, so when I saw they are still being made and are marketed at Vat19.com, I couldn't resist buying some for our lazy poolside summer afternoons. So far it seems that they work great with soft drinks - DrPepper slushie - mmmmm --and beer - beeeeeeer slushie MMMMMMM! I tried to make margaritas in one, and it appears that the non-alcoholic part has to be slushed up before adding the liquor, or the liquid won't freeze. When the liquor is added, it melts much of the slush. That's okay though, because it works really well on beer! Woot!