Update on the Lifetime 28qt I bought a while back. Still works great for me, and as everyone has said, volume and how often you open effects any cooler. My only complaint so far is the damned thing seals so tight sometimes I have to find something to pry it open with. If you hit both latches at the same time and listen, you can hear air hissing out around the lid. Makes a great seal, but also creates a vacuum. Still pretty happy with the return on a 78 buck investment though.