There's something about a cup of tea in a unique cup. It makes my day. I always have a distinctive decorative cup on the warmer in my office year round. I have never seen any like this before. When I opened the package, I was afraid that it wouldn't work because it looks so fragile. I decided that I was going to be brave and have a cup of boiled water tea. I poured the water into the cup over the sink just in case of breakage, but I had nothing to fear. The glass did not break or crack even though they need to be treated gently like you would fine crystal. My tea stayed warm to the last drop while I was working at my computer without having to put it on a warming plate. The double walled glass works perfectly as an insulator to prevent the heat escaping. Another thing is, I have a soft wood desk and I get white rings from hot cups that have sat on the finish. As you can see in the pictures, there is no damage to my desk.
I received this product at a discount in exchange for my honest and unbiased review.