I got these straws today, and am very pleased with them. The glass is thicker than I expected, very strong feeling, and easy to clean with my sippy straw cleaning brush. I'm glad I got the smaller ones, the 9mm, as they are perfect for my tea and as large as I would ever want.
I previously bought some stainless steel straws, and wasn't happy with them because they made my front teeth cold (one of the reasons I use straws, along with avoiding stains on the front teeth) and had nickle in them. I'm allergic to nickle and can't wear less expensive jewelry because of a rash that I get. I was getting soreness on my mouth from the metal straws.
These, on the other hand, are far better. My teeth aren't cold (and probably won't be hot when I switch to hot tea for the winter), and there is no allergic reaction. They don't change the flavor of the liquid, which the metal ones did.
I'm just hoping that there will be more available soon. I plan to order again when they are.
Added later on November 30, 2011: I am happy to say that they work equally well with hot beverages. You just have to be careful to not burn your mouth if it's too hot.
Other than that, they are the best thing going, IMHO. I bought more, and now have three of them so I can rotate them through the dish washer. I just put them into the silverware basket, and they come out clean. We put them back into the boxes they shipped in in the cabinet, to protect them, when not in use.
No chipping, no breakage except when I dropped one with some other dishes that hit and broke the straw. I have accidentally dropped them on our wood floor since then with no problem, so I'm sure it was the other dishes hitting the straw that broke it.