Until August, I was all over the place with KCM, barre, some Jillian, rebounding, Turbo Fire, Chris Freytag - and nothing would qualify for the title of the "Most Used on the 2012", until I bought Classical Stretch and Essentrics!
While I still use all the other cardio/strength dvds regularly, my "Most Used" are BY FAR Classical Stretch dvds. Since August, I've invested a small fortune in these, and it's money well spent. I love these, and I've noticed big changes in my flexibility, posture and my mood ever since I started using CS.