Sorry for the late response, but I have only had a few chances to bowl this month and wanted to get some more time with this ball before I replied.
The short answer is it lives up to the medium oil ratings.
I used it again today on a lane that had been oiled this morning but when I arrived the bumpers were up. There was still oil on the lane and I started out standing on 12 and throwing it up the second arrow. Five games later I had moved to 19 and was still playing the second arrow. After three more games I was standing on 33 and playing the a little left of the third arrow.
This ball works extremely well on medium, it just needs a little bit of oil to keep it from burning out before it hits the breakpoint. I think on the C300 website video Chris Barnes says he really liked the ball once it took a shine from the lane oil, and I agree.
The only bad thing I have to say about this ball is that it is a mother to keep clean. Picks up everything. I also just don't find it to be a sexy looking ball, except when it hits the pocket! But I like a ball that looks good on the rack, too. Just my preference...