micklen: I would say personally it's 10 yards for each plus, so a +2 should be around 20 yards better. I think
Whoa there, Mick. 20 yards? That might be a bit high. 3-5 yards is what I see. I never paid much attention to the driver change but with the irons I use that. Spin and wind affect that, of course, but another way to look at the difference is like this; with the free ball the rated distance of a club includes the roll out at the end (assume flat, no wind.) With a distance ball you're going to actually land closer to the rated distance and roll past it. I have always used the 2D balls because it makes it easier to trust the numbers. JMO