Title: Best insulated mug on the market
Review: Having bought no fewer than 6 insulated mugs (IM) and studied twice that many, this is the most intelligently designed IM on the market. It's double-walled vacuum construction is the best out there and remains totally cool to the touch. There is some heat loss near the screw-on top. You will not get the hot 4 hours/cold 12 hours that is advertised, but you are not likely to find a more effective IM anywhere.Regarding the screw-on top and push-button "leak-proof" spout: in the four Contigo mugs I have, they work flawlessly. I can invert and shake the mug and not a drop spills. Some review opinions complain that the top has to be screwed on just so. Yes...it does. It's a screw-on top, not a space shuttle 0-ring.My only complaint is about the top. I don't like the way the sip-spout feels, but it is acceptable. And, the inside of the top has to be cleaned with care or coffee/cream/whatever residue will accumulate.All-in-all, a great mug.
Is this product review negative?