RE: any success with winsor pilates as a low impact alt...
Sam, I've done pilates matwork for several years & love it for flexibility, core strength & even balance now that we use the BOSU & fitness balls. I still do traditional weight training but I like the pilates isolation exercises - especially the back & leg work.
I have not done any of Winsor's workouts but they have a good reputation. I do not like Winsor marketing which claims that pilates is a fat burning, weight loss wonder & the wording of your post leads me to think that you might consider it a cardio alternative. It is not.
Pilates is a great follow-up to a cardio workout. While the marketing may be misleading, the Winsor workouts do have a lot of fans, & many are pretty time efficient. The beginner ones are often at the big box stores at a good price.
Debra