Hello, I just noticed that on the XCaliber website they do not still list the 6 driver shaft, but the RT 6 instead. In the description it simply states that the 6 was re-engineered to create the RT 6 and make it more consistent. Not sure what that means, but the specs pretty much appear to be identical. Golfworks sells the 6, but not the RT. Any real world experience between the 2 and if it would be worth it to try and hunt down the RT 6 or just go with the original 6?