I bought this as a back-up to the Octopus pre-cooler diffuser. While it's not nearly as great as the Octopus, it's nice and does the job. It sucks that there's no replacement to the custom bowl/downstem so be careful with it. Glass is pretty thick, maybe 3.5mm. Good price for $25, was better when I bought it a month ago for $17...

for 30 bucks its not bad but it gets clogged after like a few packs its easy to clean tho

I ordered this to replace a precooler i broke, sorry to say it was just to heavy to fit my 12 in black leaf so beware if your waterpipe is small then don't bother with this. I have a waterpipe big enough and I love this little thing. The bowl head isn't massive but enough to let 1 or 2 people have a share in whatever legal herb you like. All that said I am happy with this piece.