i haven't try pilates w/ circle.
but i recently bought three dvds winsor pilates; Upper Body Sculpting, 20 minutes Workout, & Accelerated Fat Burning Workout.
i tried accelerated fat burning workout a few days ago. boy, it was difficult, but it def. was a good workout!

i like it a lot and i hope to continue with it until i reach my weight goal.
good luck with yours! keep it up!