You have to do the work, to get the results. You follow those videos, and yes you will see results. You also need to eat healthy along with doing insanity. I'm getting ready to start P90x, hopefully this weekend! Insanity is a little crazier than P90, but either way, good luck to you.
The Insanity workout does work but the main problem is that it is very intense to keep up with for your entire life. You also need to incorporate it into some parts of other exercise. After a week or so it can get boring. You can read more at http://doesitreallywork.org/insanity.
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