The performance of this Thermos Food Jar is excellent. Hot school lunches stay hot, to the point where my kids sometimes say they had to let the food cool down a little before eating it. It would be absolutely perfect if the mouth was just a fraction wider. Every time I clean it, it bugs me that I can't get my hand in comfortably to reach the bottom. I don't think my hands are exceptionally wide, and I can sort of squeeze them in, but it's annoying Every Single Time. I didn't have this problem with the Thermos Funtainers - I'm not sure whether they had a wider mouth, or that they just aren't as deep. I needed a slightly bigger size this time around, and this one seemed perfect. And it is, except for the only-a-little-bit-too-narrow mouth. I know it's a minor thing, but I just can't give it 5 stars.