i have one, i can tell you about it

when i first saw the video i said to myself WOW this things amazing and right when you get it, the first few hits are

the reality is that A) you cant clean it as well as it needs to be
B) each hit takes a great deal of effort and time
C) it leaks VERY easily

some places sell them cheaper than others, but honestly the best grav bongs ive hit have either been gravitrons or just homemade devices...