Value for money, can't feel them :(.
So I purchased these expecting hollow metal balls with something inside them to make them vibrate.
When I received them (fast shipping!) I was relieved to see that the packaging was discreet. The small box they come in is very cute, and not too bulky.
Upon opening the parcel I was disappointed by how small the balls were, however I acknowledged that kegel balls are supposed to be used to strengthen the kegel muscles, therefore if the balls were too large that would defeat the point.
The balls themselves were not metal, they were plastic, and light, and the "vibro" thing in them was more clunky than vibratey, just from shaking them.
I decided to give them the benefit of the doubt however, and gave them a full afternoon of use.
To be completely honest, I couldn't feel anything from them. I acknowledge that maybe I am not as sensitive to that kind of stimulation as other women, however I was a bit disappointed they didn't do anything for me.
For value they are about as good as you would expect from a $10 sex toy, and at least they don't appear to be made from any carcinogenic materials. However, I would be inclined to recommend that people shell out the money for a better quality toy.