There have been many who have had issues with the ball cups, and many who haven't. They require a little more attention than other brands, but understand other cars have uniqueness also. Show of hands--how many b4's owners out there with RPM ballcups? Or 22 owners running AE diff parts, Or etc.... I have the stock ball cups on my car, and also have them on my 410, and they have never been a problem area..