Take this with a grain of salt because I own the RBZ driver, I bought it because I liked the feel of it, not as crazy about the sound but getting used to it. I hit it further then my old launcher, but that is because it is a better fit... I went from a 10.5* Launcher 460 to the RBZ tuned down to 8*... it's so nice to get rid of the balloon ball on the driver.
I used to get very little roll with my driver because the ball was launching to high and would balloon, especially with an wind in my face... but man would it go with a tail wind :). with the RBZ I have a much better ball flight, I carry the ball the same distance, but when the ball hits the ground I actually get some roll... because of that the RBZ is longer for me, but again It is a better fit.
I also hit the Ping G20 and the monitor said I hit it a yard farther on average, but with a shut face and what I felt was a mushy face at impact, I went with the more solid feeling RBZ... I was hitting fades on the Launch monitor with the RBZ and draws with the G20, my normal ball flight is a slight draw, I hate the way the ball looks when its going right. my swing has settled in and the ball is drawing for me.... again I gained distance but i feel any driver that was properly fit would have given me more distance... Just for reference my swing speed on the launch monitor was 110 +-1 and I was averaging I think 260-270 carry and total distance of right around 280-290 total on the monitor, with a couple rolling out to 300... I find this to be accurate with on course distance...
I also feel more confident with the new stick in my hands, but i would hope that would be true with any new driver.