It's a funny difference, the feel of a pressureless ball. If you drop it from shoulder height, it will probably bounce roughly the same height as a regular ball, and if you hit it at softer speeds will play pretty close to a regular ball. But the harder you hit, the more pronounced the difference, I think. But it's a lot easier to get used to hitting 3-month old pressureless balls from your hopper than 3-month old dead regular balls.