The Joyballs Secret by JoyDivision was my first kegel exercising product. I really enjoy using them! The balls are easy to insert/remove and feel great while they're inside. The balls have marble weights in them that bounce around when you move about. This "trampoline" effect feels fabulous! If working out the rest of my body was this pleasurable, I'd be in the best shape of my life.
The most helpful critical review
Overall, I'm sure this is a perfectly fine set of kegel balls, but I'm just not that into them. They really don't do anything for me and I'm definitely not going to buy again. I'm glad that I was able to experience them so that I can stop wondering if they're worth trying out.