The freeze pipe does really well at cooling the smoke! It freezes fast, but it also thaws out really fast. I bought a freeze pipe sleeve to help it stay cooler longer but it really doesn't. For one thing the sleeve is too small. It doesn't adequately cover the freeze section. All in all, on a scale of 1 - 10, I would give the freeze pipe a 2. My water bong does just as good a job as cooling the smoke as the freeze pipe and it last a whole lot longer. You actually would need three freeze pipes to make it efficient. One in the freezer, one that you are using and one being cleaned. For the price you pay for each pipe, I personally don't think it's worth it.