I like these infusers well enough. They’re fairly sturdy as glass infusers go. The bottom is perfectly flat though, which causes a bit of suction on most wet surfaces. I haven’t had this problem with other double-wall glass infusers like this, and I’ve owned quite a few. The upside is that this design makes them very stable.
I use both the small and large version, particularly with Longjing teas. I’ve begun using the smaller one more frequently in combination with my 5 oz Finum glass. Find they compliment each other very well, being a good size match when brewing and leaving a root.
Though not my favorite, I still end up buying these, as I can get them at a discount from my local tea shop, Wing Hop Fung. I break my glassware more often then I care to admit, so price and convenience is a consideration. The downside of buying from Wing Hop Fung is that it appears they often carry seconds, which usually translates into minor visual imperfection, or worse, the filter doesn’t fit properly and will push through. Often this can be corrected by bending the little tabs that help hold it in place, but better still is to just dig through all their boxes until you get one that’s in good shape.
If you find yourself in Los Angeles, it’d certainly be worth checking these out, especially if they’re having a sale! Otherwise, not being able to inspect them first, I’d be hesitant to order one online.