I recently purchased Jillian Michaels Killer Buns & Thighs and I absolutely love it. I was suspect of it at first, just cause I wasn't sure if it would work. Well, I have used it probably 5x now (I take 2 days off after I workout since it's a large muscle group to let it repair/rebuild). All I can say is I have already seen an improvement. I am not trying to toot my own horn at all, but I did have a decent base to start with so my results might be quicker than some just because of that reason. But these workouts do legitimately make a difference. I have seen an improvement in fullness, roundness, better glute-hamstring tie-in, and lift. I can't wait to see the improvements over the next couple months. Yay :)