Bests & Worsts Reviews from Amazon

Sipp is the latest tumbler from Thermos & has several improvements over my Thermos Nissan 14-Oz Stainless-Steel Travel Tumbler. Although the Sipp is good, there are some small cons. PROS: 1. Keeps drinks hot Thermos Sipp keeps my coffee piping hot at the office (which is air conditioned) much longer then the Nissan tumbler. Drink is really hot after 4 - 5 hours even with button in open position. Drinks in the Thermos Nissan would be lukewarm by then. As other reviewers have said, be careful not to have drinks too hot or risk a scalded tongue. 2. Leak proof New mechanism and seals makes the Sipp leak proof when button is in closed position. It will not leak when held upside down (great for traveling). Thermos Nissan has to be kept upright as it is not leak proof. 3. Holds more drink, Fits my car I love the bigger capacity of 16oz. Slim design fits cup holder in my car. 4. Easy to clean Mechanism is easy to take apart and clean. Unlike the Nissan lid which traps gunk in the corners and beneath the rubber rim. CONS 1. Seals Two soft seals in mechanism ensure no leaks. However I'm not sure how long these will last. Thermos has not replied to my enquiry about replacement seals. Tumbler will still be useable, but not leak proof without the soft seals. 2. Where to drink from Two slit openings on the inside depressed section allow liquid out. Because there is no handle, there is no tactile reference point when the tumbler is picked up as to where to drink from. That may be why a reviewer had problems with spillage. I get around this by referencing the plastic label on the mug wall which I line up with the drink slit when putting the lid on. With the Thermos Nissan, the lever is the physical reference so I can pick it up & know where to drink from without looking (eg: when reading documents). The Sipp has many great features & I'm very pleased with it. It is a worthy successor to my Thermos Nissan which is still good after more than 5 years of faithful service. However I gave Sipp 4 stars because of the uncertainty of getting replacement seals (at the time of this review).