I've been using this for 3 weeks and am very impressed. I've used it for iced coffee. It seems to keep ice pretty well. I left it in my car over night and when I got it in the morning it still had ice. Can't wait to use this in the summer. It did great with hot coffee. Kept it at the perfect temperature until I was done with it. Fits great in cup holders. The straw lid has a really awesome rubber so it if it tips it doesn't spill out immediately or anything.