Top positive review
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I did a detailed test..
on February 15, 2013
I bought three of these, and tested them all at once.
First I put hot tap water into them for a minute or so. The water was 115 degrees as indicated by a Taylor Digital Instant-Read Pocket Thermometer. I opted not to use boiling water for the pre-heat because that seemed too much of a burden to make a routine.
I then put in boiling-hot water, which was verified as 212 degrees F, again using the Taylor Digital Instant-Read Pocket Thermometer.
I sealed all three jars. The room temp in the kitchen was 65 degrees F - just a bit colder than "room temperature."
After exactly three hours, I opened one of them, and the water was 152 degrees F.
After exactly four hours, I opened the second one, and the water was 147 degrees F.
After exactly five hours, I opened the third one, and the water was 138 degrees F.
I also did a real food test - using Progresso Light Beef Soup. First I filled the Foogo with 116 degree tap water and let the cover sit on it while I microwaved the soup for 4 minutes. The soup pretty much refused to get over 180 F, so I did not have high hopes for it staying hot for a full 5 hours.
After 5 hours, the soup was 126 degrees. Eating it was not what I would call hot, but it was as warm as our dinner often is by the time the kids settle down and we actually start eating. My wife tried it, and thought it was fine. So 5 hours is doable, but is a practical limit.
Conclusion - the product works as claimed and the food will stay hot for five hours if it starts out boiling hot, the jar is at least minimally pre-warmed with hot water from a tap, and the jar is stored at room temp.
If boiling hot food is cold after an hour as a few have said, you should exchange it for another one - probably didn't have the vacuum seal.