I bought a NOS 1981 vintage Stanley 1 qt. Then i got my 7 yr. Old Chinese made Stanley and filled them both with water from my coffee maker. I put them outside where the temp stayed in the 20's for 20 hrs. Adjusting for a slight temp difference when filling both bottles, the vintage Stanley was 10 degrees warmer in the end. So while the vintage did outperform the new one. It wasn't by much. That said, I hate the stoppers in the new Chinese models. Mine is ready for its third one.For quality and durability you just can't come close to the Aladdin Stanley stainless steel insulated bottle. Twist open cap and nice cup. Almost all current all steel bottles copy the Stanley. We've had them fall out of trucks at highway speeds and they hold up. I don't think they hold heat as well as the glass-lined "thermos" but they get the job done.