I got my Talon when they were built here in California and it came with the aero seat post. I've ridden it over 6 years and it does everything well and has served me well. I have also test ridden the S1 and it's definitely stiffer than the Talon but I liked the overall ride quality (comfort wise) of the Talon better. I have not ridden a Fuji Roubaix RC to comment on.
My Talon is White and it's funny that White is back and aero tubing in road bikes are catching on.