I just wanted to post this on Roto Grips form site. Last night I shot 289,278,245 for a 812 series. I was using a Rush that I purchased from a BBR member. I have a hard time not putting that ball in my bag. This is the second 289 that I shot this year. Both times with the Rush. I have been thinking about getting a Grand Illusion but the Rush has been so good. Hard to justify getting a new ball when the old one just won't quit. Maybe I will look into getting a used Grand Illusion 15lb. It's hard to imagine another ball rolling like the Rush.