We love these balls
I've been using these balls for several weeks. They play great; not at all heavy. Small differences -- they perhaps sound a little louder when struck, I think they pick up better on half-volleys than normal balls. Of course the real differences -- they use far less plastic than normal balls that come in a tube and they apparently last forever. I'm looking forward to seeing how long that is. Overall, they are bound to be more economical.