Smashed my first Chong bong's bowl and stem on the first day. PTFE and gaffa worked for a bit but I decided I needed another Chong! Took a chance on this. It is incredibly smooth, the tiered percolation really cleans up the smoke. My first chong would get tar all the way up to the mouthpiece. This is clean out top, the chambers are doing a great job. Highly recommended, really solid piece.