Sky:
I've got a ball-drive Paxton GSS blower myself and have had no problems.Where people do run into problems,is when they don't change the fluid in the compressor itself on a regular basis.The fluid that came with my kit,when it was bought new was,Type F transmission fluid.
You need to find out what fluid they were using in the compressor and
use the same type of fluid Many people who switch fluids have problems with bearing failure,so use the same fluid as the previous owner used.Also when increasing boost to the 8-9lb range with these it is
mandatory to get a oil cooler to help keep the compressor cooler with these boost levels.
I myself am running only 6lbs of boost but will be increasing it to 8-9lbs with a oil cooler during this winter.
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Paxton Blown 87GT