I have -
Gravity Shift with approx. 400 games
Dimension with approx. 200 games
Virtual Gravity with approx. 100 games
Second Dimension with approx. 200 games
Virtual Energy with approx. 50 games
All R2X, all with virtually no change in reaction since I bought them. Clean your equipment after every use and hit sanded balls with abralon every 10 uses or so. You will not experience ball death - period.