Confusion reigns. Setback posts are the norm, for the vast majority of road bikes. With the general trend toward steeper STAs, setback posts are now more important than ever. Finding a nonsetback post on a pro's bike is rare.

The front to rear weight balance should not be 2/3 on the rear. I use a lot of saddle setback, with the nose of my saddle 6-7cm behind the BB center at a 73cm saddle height. Even with a lot of setback and a short torso, I have about 45% of my weight on the front wheel. Anything less than 40% is too light, IMO. The weight balance should be measured with the rider in his most agressive cornering/descending position.