Buy the official dvds and you will be off to a great start. You will also find a large community of Insansity enthusiasts wherever you go. My discs play flawlessly, but I am cynical about pullingthe out and pushing them back into the cardboard jacket. So get some jewel cases.
This was shipped quickly and arrived in pristine condition. It is an enjoyable plyometric program that almost anyone can use with good results. Of course, the more fit you are, the more you can drive yourself. I wasn't in the sports athlete category (and I suspect most people who buy this aren't) but by carefully listening to my body and persevering, I did gain more flexibilty and power.