Don't know about Timesaver yet, but I do use The Terminator. Think of doing 8 Imax II intervals and the step/compound weights premix of Cardio and Weights together in a circuit? That is what Imax Xtreme is. It is loooong, but you feel great when you're done. The Viper is I think 85 min. long and is a total body (minus abs) circuit workout, but I rarely do that one. The one I have used lots of times and really like is The Gauntlet. This one is great. I do the Imax II/leg/Boot Camp cardio and ff through the Boot camp upper body and Cardio and Weights compound segments. And Aquajock told me about a great idea which I finally tried last Sunday - doing just the Imax II and Boot Camp cardio sections. Talk about tired! But I felt great once it was all finished. Did this help at all? I hope so!