I don't think so. Mine are original to my 1992 hybrid, and are still in excellent shape. (EDIT: No they're not. My middle chainring at least is displaying the signs of being worn, looking just like the Sheldon Brown example. Sigh. Mo money...)

I think the Biopace rings were different from other oval chainring, in that the longest diameter is set to encourage "spinning" rather than giving more power to the power stroke, so it's about 90 degrees out of phase with other oval chainrings.