Sr,
The Pro Purple is one of my all time favorite balls. I had modified the surface a few times with Trizact, but I have now restored it to the original specs, according to Lane#1. Mine is also drilled label, a 4"x5" for my PAP. It is a very strong ball for me, and is basically my oiler. As such, I don't get a lot of use for it, but I always carry it.
It is very release sensitive because the core is so mild, medium RG (~2.54) and low differential (0.028 ~ 3-4"). The cover is most of the reaction.