I bought a single GRAV 5" Steamroller to check it out. What I found was that IMO, this pipe is a quantum leap above all previous iterations of one-hitters. Primarily, the historic problem with ******* in ash debris has seemingly been solved by a clever narrow mouthpiece cone opening that keeps the air intake above the bottom of the pipe. Way cool. And then, it's clear and EASY to clean. I ordered a second one to have two. I have one in isopropyl alcohol while I use the other. Next morning, I take out a clean pipe from the alcohol bath and put the other one in. At less than $15, you can't go wrong.