Been looking for a good bowl with a built in screen or drain style.
I ordered several of the GRAV Octabowl from here since these were out of stock for a while. I like the Octabowl, but those were hit or miss for me. The criss-cross glass for the screen in the Octabowl may have good sized holes, or small ones. I got two that are good, another one clogs after just a few sessions, so not usable for me.
When these came back in stock, I picked one up and I'm in love. So far I've used it for multiple sessions/day for over a week and it still hits great. No clogs at all. Needless to say, I came back here and ordered two more of these for other pipes I have and so that I've got a backup.
I still like and use the Octabowl, but this will give you many more sessions without having to be cleaned. Of course, it lets a bit more ash through, but that's to be expected. I'm not too lazy to clean my equipment, but I prefer to do it on weekends and have it remain functional for me all week. Winner, winner, chicken dinner with this bowl for me.
Kind of expensive compared to the Grav, but this is the best bowl I've found that has a drain/built in screen that is this clog-resistant. I currently own three, but will replace them if/when needed.