I'm very amazed with this product. I had been using a different product for years, and they made changes to their product, and I found this mug - it is amazing, and does not have the issue with the previous mug I used.
I love that cats can't knock this down, and most of all It IS leakproof! I work around computers, and being leak-proof is the #1 usability/selling feature for me. I highly recommend!!