WORKS PERFECTLY !! Got it as a gift.... works exactly as stated....  love the size.... I would say it keeps thing hot for the time they say... easy to clean...  For the person who left it one star because you didnt get it delivered ..this is not where you leave a review, you leave a review with the shipper for not delivering it !!.... dumb dumb.. I have no problem with either lid as they both work fine for me... of course one screws and the other is not loose as is just "seats" in the mug (someone had an issue with that I saw ! ) fits in my cup holder in car so all in all its a WIN !!  Very happy with the larger size too !!! THANK YOU !!!  LOVE all my ember products !!