I bought Insanity Fast and Furious about a week and a half ago.  Tried it for the first time tonight.  To my understanding, this workout is basically supposed to be a quick 20 minute substitute for days that you can't do a full hour of the normal Insanity workouts.  
I was under the impression that I would be working out for a full 20 minutes.  Not the case.  It has the same format as the normal Insanity DVDs.  It starts with a 10 minute long warm up and stretch (I expected a more intense warm up - not the case).  You then work out for 8 minutes, followed by another stretch.  An 8 minute workout???  I barely broke a sweat and didn't even need to take a sip of water.  What a disappointment.  I was really looking forward to this, too.