The Game Breaker 2 (GB2) is a better IQ Tour than an IQ Tour. It has the same characteristics of being all about control over a wide variety of conditions, but just does it a little better.
I'm not an IQ Tour basher. The IQ Tour was responsible for getting me two of my Senior Regional cashes. It was my go to ball when things got tough and ugly for several years. But the GB2 takes things up a notch. It's really a special ball.
I have a GB3 on order to take with me to the upcoming PBA50 tournaments in Vegas. I suspect the GB2/GB3 combination will be the primary balls I use throughout the tournaments.