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Pretty much all of the foam ones compress over time.
We much prefer a small ball for hitting spots with better accuracy and pressure. Foam roller is a good warmup and helps loosen up (popping) the thoracic vertebra.
So lacrosse ball, golf ball, baseball, softball, etc.
Most of our trainers swear by this thing or another one like it.
http://www.roguefitness.com/the-backnobber.php