I enjoy using the glass tumbler for my teas and matcha iced or hot. It does keep the desired temperature longer than a regular glass cup since it’s double walled.
My glass came with several bumps on the glass. At first, I thought it was something that could be washed off, but it’s actually bumps from the glass itself. It may be from lower quality glass(?), I’m not sure what it is, but the glass isn’t smooth and scratchy where the bumps are.
I think the cap or lid could be improved. When sipping, the liquid doesn’t flow well unless the straw top is opened. The top of the sip portion does not remain open, it will fall onto your nose. So whatever liquid you’re drinking may end up on your face, it’s a bit inconvenient when I have makeup on and need to clean it off.
Overall, it’s a good product and I have recommended it to my friends.
