I started out with a reebok step, which is shorter than Cathe's. I moved onto a the Susan G version and finally found the original healthclub one (exactly like the one Cathe uses in her DVDs) on Craigslist for 35$. I say go for the full size one you will use it for everything. The longer step...
I never have posted a reply, but thought I would put my 2 cents in. I love love Cathe and have almost all of her workouts. I love BMC, LIC but still can not get through 4DS. There is not much break down, repitition of moves by Cathe. While I can see how 4DS would be tons of fun once...