On my current pool table (albeit pretty cheap and nasty) I was never able to get much spin on the ball. If I was down the pub, snooker hall etc I could generate spin much easier so I always blamed the table cloth. It was in fact the balls.
After throwing away the balls that came with the table and buying these I can literally get as much spin as I can on a decent quality table. I never thought balls would make such a difference, but they do. I think the main reason is the white ball is slightly smaller than the other balls, with my previous set they were all the same size.
Anyway, good quality balls. Happy. :)