Recently bought a vortex cold fusion bong for the roomates, and its easily the best I've ever used. The neck is filled with glycerin, with the tube going through it. You leave the neck in the freezer overnight, and when its ready the thing is redculously cold. Throw some ice in the bottom, and you get the smoothest hit you could possibly imagine. The bowl is conected to an ash catcher, then a perc stem to the water resivour. Its literally like drinking water, amazing. Post what you think, or if you've tried one and what you think about it.
i have never tried it b4 but a friend of mine hooked up with the company that makes them and was marketing their green version of formula 420 to local headshops. he was given some free stuff and i think he got one of their bongs looks nice man, merry xmas to u 2