Yea, crazy and scary at the same time. I took the balls out every 20-30 minutes to wipe off oil and finish off with ball cleaner. After a couple of hours, I was afraid I was bleeding plastizer and other resin chemicals from the balls. But in the end, they all reacted like NIB.
 
NuBall does work when there is oil to extract.

Yup. There was a vast improvement in ball motion for the bleeders I did. Three that I remember specifically were a Crux, Amp Up, and an old purple Triton. I'll likely never get as much oil out of my own stuff, but there's still some and it's really nice to have a NuBall unit. Afterall getting the equipment for my teammates in shape benefits me on league nights as well.