I actually got this ash catcher off Amazon. It is amazing. It keeps your bong pretty clean for a long time, the extra diffusion and volume allow you to take way bigger rips that feel smoother. Oh, and not to mention, just looking at it while the chambers create so many crazy bubbles and you can see each chamber starting to milk up. I like to swivel it around sideways to get a better look.
One thing, which applies to all ash catchers, but especially this one, is that it is going to add a good amount of drag, so it's really good for stacking smoke, but not the best for clearing. My tip: after you pull the bowl, wait until all the smoke is cleared out of the ash catcher, then pull that off as well. It let's you get the smoke past your vocal cords faster so it basically makes it less painful on the throat.