I have both of those tapes too. And as Michele said they're execllent!! I think StepMax is very similar, even has the same set!! All three of these could be good substitutions, but I feel that StepMax is the most similar followed by StepFit, and then StepWorks. I feel StepWorks is the most intense, then StepFit, then StepMax. Anyway this is just my opinion, but with all of the tapes, I think you'll find similar moves that you can modify. Hope this helps ya'!
Aimee