IMO, it's a must have. I also do yoga and love it, but this is athletic stretching and more STRETCHING than flexibility work in yoga. When I do yoga, for example, I find my upper body not very stretched out. I like that Stretch Max makes sure the entire body gets a thorough stretch, especially after some workouts that don't have as much stretching. It's also, for me, faster than yoga, at just 20 mins/segment. My shortest yoga is 30 mins. Anyway, just my two cents, but it's definitely worth having and I do it at least twice/week with any rotation.
Carol