Hi Elsie,
I usually mix in my kettlebell workouts with traditional weight lifting. In January though I did a mainly kettlebell rotation that included the AOS dvds, my own workouts and 200 swings every day for the month of January. I saw some really great results in terms of toning in my abs, arms and shoulders. I also felt that I gained some strength and endurance.
I'm doing STS now but I will probably insert the 200 swings on my cardio days.
HTH,