It cleans my hits and makes my piece smooth as breathing.
I have a straight 14" or 16" grav much like the one on the website and it was well over due for an ash catcher so what else would be better than a matching grav with a shower head down stem! Unfortunately the guys in the shipping department grabbed me the regular one with holes (nothing fancy) but I decided to keep it anyway. Hits like a champ, really evens out your percs throughout your entire hit! Noticeably different experience.