i do not. i think they are a waste of weed, and i have short arms, and small lungs. and i had a bad experience one time, my friend wouldn't pull it when i said to, and i coughed so hard my insides felt bruised and i almost threw up.
They are cool to look at and I'd probably smoke someone else's if I had the chance, but they simply are not practical for me at this time (small apartment, nosey uncool landlord, too many cats that knock stuff over all the time).
see what i do is actually good for conserving my ganj. i use it as a one hitter, i have a tiny bowl and a huge bowl, tiny bowl is for the one hit, and it rips you up. Some people have trouble clearing it but its manageable. edit, also look how tall i am, the bong is a couple inches over 6 feet.
I like big bongs because that feeling you get when you are about to puke. That goes away in like 30 seconds and then you are just high as fuck.
I love big bongs. Hard to get the entire hit sometimes, but the end result is usually so baked you're on your ass...