I absolutely love these cups, an they look super cool holding my frothy coffee. 
I love the fact they keep my drink warmer for longer, they do seem super hot when you first start drinking, so beware. 
The only reason I didn’t give them 5 starts is because they are hand wash only (I prefer to Chuck things in my dishwasher), and I’d like them to be a little bit bigger, without having to compromise on the style. 
They do seem delicate but yet very sturdy, if that’s even possible, and I love the fact that you don’t even need a coaster, as the outer layer of the cup doesn’t get hot.  I love mine, I just need to keep my 11yr old daughter away so they don’t get broken