The way the percolator is mounted it causes an air bubble, which renders the downstem it comes with almost useless. That air bubble makes it so you absolutely CANNOT use any add-ons that use water (after you take your mouth of the bong, that air bubble is gonna shootout your downstem blowing all that water from your add-on out all over your lap). Dry add-ons work fine. The use for the downstem for this piece is essentially to keep the water from splashing into your bowl. Having said that, I have gone through multiple bongs I thought were high quality or would be great because of multiple percs, this bong is proof that sometimes less is more! It’s not just super thick glass, it’s high quality glass as well. The geometric patterns are etched into the glass double as a grip. My only suggestions would be to place a small hole at the top of the percolator, to Get rid of the air bubble and put the ice cube notch’s up about an inch higher. Due to the amount of water the percolator needs, when you take a big rip, some of the water gets pulled over the ice causing it to melt super fast.