I was very excited to try these out, but found I was very disappointed. The moment I opened the package they fell apart! I didn't feel like going through the whole pack them up and return them process, so I grabbed some super glue. The balls each have a seam around them and inside is a free moving metal ball that gives them their weight. There was inner lip on one half of the outer ball which I could put the glue on, put the other half of the ball on, and it wouldn't be exposed. So I applied the glue.

After fixing them and letting the glue dry I inserted them and walked around the house. I could hear them rattling rather loudly as I walked. I was walking in my underwear, so it is possible that if you wore more layers it would stifle the noise a bit. I would be okay with wearing them out to the mall or somewhere that is loud, but probably not around the house with other people or in a quiet place. I do feel my muscles working. They also give you something to sqeeze on which can be very helpful for some people.

Overall if they were made a little better I would be very happy with them. But unfortunately I do not feel that someone should have to repair their toy before they even get a chance to use it. The rattling could be a turn off for some people. They feel a little strange at first, but take only a little getting used to. I found I didn't require any sort of lubrication to get them in. The plastic is very smooth, making insertion and removal a breeze. There was no pain or dragging.

I would give this toy a 2 out of 5 stars. The breakage was a real bummer. I don't know if it's just my rotten luck that I got one that was defective, or if they're all this cheap. Once repaired I did enjoy them.