The first time I threw my Versa-Max in NIB surface, I was really impressed with it's back-end move. Then the next 2-3 times, it didn't move as well, so I re-sanded it to 500 grit Abralon, polished with Brunswick Ruff Buff, but didn't polish out all of the sanding lines, and I finished it off with Brunswick Factory Gloss Polish, and the ball has now become a monster every time I have thrown it now. Great move and great pin mix/carry on the back end with great energy when it hits the pocket. Although I can't bowl a much as I like for health reasons and shortly I will be out of bowling for at least 2 months, when I do bowl, this ball has become the first ball out of my bag. Currently seems to work on a variety conditions.