Hi:
I used a home made step for several years before finding one second hand for $7 at my local recycling centre: was I psyched or what?!?!?!
But there is a difference. My wooden one, did sometimes tip, I had to be very careful about placing my feet and weight. It also pounded the knees and ankles more. The plastic step if far more forgiving especially for Cathe power moves. I would never go back to the wooden step again.
If you can save up or get one used (the person who used mine before nailed it together at 8 inches, but it's still perfect in every other way!!!!) you will never be sorry. Put an ad in your local classifieds: people always start exercise programs and up to 60% give them up, so there is equipment out there rotting in someone's garage. If they see your ad, they may just call you and bingo!
Clare