If you are thinking of getting Enter the Kettlebell, you might want to think about getting Coach Sonnon's Official Kettlebell Foundation Dvds.
http://www.rmaxinternational.com/KBF/
As the title said, it is a foundation dvd but you will be surprised to what you can pick up from the dvds. There are techniques which I have not seen in other tutorial dvds. There is also 3 different breathing methods which turned out to be so beneficial.
I have quite a collection of kettlebell dvds from AOS to Steve Cotters to Pavel"s and I would say these 3 dvds are worth the money spent on them. However, to note, this is not a workout dvd except for the warm up and cool down dvds which you could use them everyday on their own.
I was actually skeptical about how good they can be. Now that I have them, I would say it is a must have. Also take a look at Sonnon's Flowfit programme. It is very interesting.