I purchased the LELO Luna balls for two reasons: first because I have some mild urinary incontinence, despite having no children, and second because I was hoping that tightening up my PC muscles couldn't hurt when it came to increasing my pleasure in the bedroom (I have trouble reaching orgasm). I have been trying to do Kegel exercises on my own, but it really is hard to make sure that you are targeting/contracting ONLY the PC muscle and no other muscle. The Luna balls take the guess work out of Kegels.
Like some other reviewers stated, the balls do seem a little big at first, but I have found that the size isn't a problem. In addition, like other reviewers, since I have not had children and am tighter to begin with, I started with the heavier balls and had no trouble holding them in. That fact worried me and had me thinking that the Luna balls were going to be little or no help for me, but I decided to not give up. I started out wearing them all day, even to work, and I work at an animal shelter on my feet all day. So, I was really putting them to the test having to hold these balls in place. During the day, I could feel the burning in my PC muscle. I knew it was working. As to feeling the small weighted balls moving around inside the bigger balls: I can feel them, but the feeling doesn't give me any pleasure. Maybe it does something for others, but it does nothing for me. At the end of the day, when I took the balls out, my muscle did not feel overworked, but I feel that it got a great overall workout.
Now, I have had the Luna balls for about a week and my urinary incontinence is GONE and I can contract my PC muscle much tighter than I could a week ago! In addition, my sex life is improving a little. It says in the pamphlet that comes with the balls that it could take up to 12 weeks to see noticeable results and I understand that because you are literally working a muscle that you have been forgetting for years. So, I am being patient and optimistic.
I gave the Luna balls 5 stars because they cured my incontinence and I am becoming very optimistic about them helping me with my sex life.