I recently purchased the Diamond Glass Double Gears bong with a matching Diamond Glass Double Showerhead Recycler ash catcher. I would definitely suggest an ash catcher with this bong because the two separate gear percs within the bong share the same water. It is the only bong that I have that works in this way and it's very smooth and cool looking. The Double Gears performs totally different than the Single Gears system, though the end results are the same and I own both. Cleaning is a little more tedious, but it's still relatively easy because you only have to focus mainly on the top perc section when cleaning. Drying out after cleaning takes longer. All residue end up in the top chamber, while the bottom chamber stays relatively clean. The Double Showerhead Recycler ash catcher does an excellent job of keeping all of the dirty water of the ash catcher from reaching the main piece, significantly reducing the overall cleaning time for the entire system. There is a little drag, but that is due only because of the amount of water required to operate the system and the way in which this system uses the water within. The drag does NOT hinder the performance of this piece in anyway and like MOST Diamond Glass bongs, airflow is NOT restricted. Aesthetically, I have NO complaints as usual with Diamond Glass. Craftsmanship is top notch using premium glass. I added an Ehle Large Cylinder bowl. I typically do use the bowls issued with bongs because of their limitations in product capacity and restrictiveness of air flow. Big, cool and tasteful hits, with little or NO coughing. This is a serious system for serious users and I would definitely recommend it. I've been shopping with BAG since 2016 or earlier, so I don't think I really have to comment on their excellent customer service, quality products, fast free shipping, and expert packaging. The Diamond Glass Single and Double Gears bongs do NOT disappoint and are great additions to you glassware! NOTE: It is my personal experience and opinion that the Diamond Glass single or double gears bongs work best with a Diamond Glass Recycler ash catcher, though they are compatible with other brands. O'yeah, if you want to produce large clouds or plumes of smoke, well, this bong/ system does that very well too!