I love this cup!
I have tried it with both cold and hot beverages and either way it works amazingly.
My only gripes are that :
A)It does not fit into my cars cup holders (way too big)
and B) the breathe hole is a bit too small so liquids come out slowly.
It keeps my coffee hot for hours-even with the lid not closing.
It keeps my water,juice or soda cold (without ice!) for hours too!
The lid is made of what seems to be a very hard thick acrylic (not glass and not cheap plastic) that slides (not screws) in to the cup.
So far it seems fairly tight and I have no worries of it falling out while i drink.
Very easy to clean as well.

Review by on April 29, 2016