I bought one a week ago after seeing them advertised around on newsfeeds.  The shipping was FAST!!!  I tested it with just a can of beans. I thought when it said it was "slow" that it might take several hours.  (Like plug in once you get to work at 8am and it would be hot by lunch at noon).  NO!!   My beans were hot in about a 30-40 minutes.   I can't wait to use it tomorrow at work and make m coworkers jealous. 
Love this!!!!