I had two of those balls. They were two of my favorite pieces at the time I used them. I think righty Complex pretty much nailed it, and I trust his instincts since he is a professional driller.
All the balls that I am drawn to, and seem to fit my style have those exact stats. RG at 2.48 and differential .048. When I went down the list of the successful balls I have used, they were all pretty much in that same area....VG, Optimus, Phase, even an old Quest. Check out those stats and see....