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Well dan at least they are not stuffed with that old recycled paper!
I have a DF3 and used to ride the PX Pro Track but could not get on with it as the front-centre measurement was too short for me having quite a forward body position. I prefer a more relaxed head angle and a steeper seat angle with a long TT for my height.
I actually really liked the frame and my guilty confession is that it looked pretty nice to my eyes... anyway. I never noticed the lack of stiffness that some can feel, I always notice flex in the handlebars/stem much more than the BB. Handlebar flex always annoys me and I have rode for years with the very stiffest combo I could find which I can pull on hard without trepidation.
In the end I did not feel the need to dislike the PX Pro Track and it was just the geometry that was the killer for me and the current owner of my old PX is very happy!
Legend has it that they are stuffed with newpaper...