Being just over the top of the high end of my budget, the choice to purchase the Grav Labs Coil Showerhead Water Pipe was a carefully considered one for me. 420Science helped make the decision by racking up positive reviews for good service on a kickass website; I was sold in large part by the videos showing how air travels through some of the products they sell. (Whomever's idea that was, they deserve a raise).
Anyway, the bong itself is really something; beautiful on display and a lot of fun to use. I probably enjoy looking at it as much as I enjoy using it. Remarkably--and this is the part of the multiple high-praise reviews it gets that I had the hardest time believing--it is very easy to clean. I use 420Science's Rez Block which is new to me, but seems to work just as advertised. I do replace the water pretty frequently, but just a little rubbing alcohol and salt cleans it right up. Being one who actually enjoys mundane maintenance tasks like that--changing guitar strings, cleaning records, polishing metal, sharpening kitchen knives--I almost wish it was harder. It's literally too easy to clean. lol