So I've been using my glass katakuchi bowl for the last couple of weeks, and I have to say it is probably one of the best purchases I have ever made. The bowl itself is incredibly lightweight yet feels extremely sturdy, when whisking matcha the whisk just glides over the glass without any resistance (I noticed my previous stone chawan had some resistance which would wear the whisk down eventually) and the fact that it's made of pure glass means I can actually see the colour of the matcha while I'm brewing it. I also absolutely love the way they've added the handhold around the middle - it makes it incredibly easy to pour the matcha one-handed into a smaller cup for drinking, and the whole bowl just looks absolutely beautiful.
All in all, I don't think I have ever seen such a beautiful chawan before - it's definitely made brewing matcha a lot easier and I'd recommend it to any and all matcha enthusiasts! :)