No, the extra riser just makes it more challenging for strength training purposes. If you can do so comfortably, try to use the same height that Cathe uses. Of course, for anyone who is significantly shorter than Cathe (unlikely because she is 5'2"), then it may make sense to modify.
OOPS, sorry. Just realized this question was posted on the "Ask Cathe" board and I answered rather authoritatively. I really don't know what Cathe would say, and I can only hope that she would agree with my response.