Lets say you hate setback posts. Then you would want the reach + sta anyways or you may end up needing one.
Setback posts are needed with most saddles. If you don't use a setback seatpost you have either extremely short legs with disproportionally short femurs, you are riding a full suspension MTB or positioning for a 1990s time-trial. The question should not be "setback" or not but how much. With some saddles and steep seat-tubes standard posts can be insufficient--- that is where seatposts such as a Look Ergopost enter the picture.
Setback posts are needed with most saddles. If you don't use a setback seatpost you have either extremely short legs with disproportionally short femurs, you are riding a full suspension MTB or positioning for a 1990s time-trial. The question should not be "setback" or not but how much. With some saddles and steep seat-tubes standard posts can be insufficient--- that is where seatposts such as a Look Ergopost enter the picture.