Michael, you've really built this blue circle Centennial cue ball up to being something really special - I hope you're not let down. I probably have 25 of them in various conditions, but the only time I use one in our poolroom any more is when I'm practicing 14.1 or playing a 14.1 match in here, in which I break out a virtually new set of Centennial balls and a new blue circle cue ball.
Otherwise, we use sets of Aramith Super Pro balls all the time, a red circle Aramith cue ball throughout the week, which is very easy to keep clean, and we break out the Aramith Pro Cup Measle cue ball just for our Monday night tournaments and our occasional bigger tournaments.
I honestly can't tell much difference in the Brunswick Centennial blue circle, although some old time players will swear it plays differently - lighter, heavier or whatever.
When you get it, you'll know it's a legit blue circle when you experience how hard it is to keep it nice and clean. Even simple fresh blue chalk marks on it from your cue tip don't seem to wipe off very easily. It will also gradually yellow over time, like many pool balls do. If you think you don't have a legit one, PM me, and I'll be happy to send you one of my used ones in good condition!