Don't do it.
Overpriced. The performance ultra shorts with the blue chamois is probably one of the most comfy that i've tried. Their new ones with the gray chamois is pretty good too. You can get the latter on sale for $50 and the former on sale for $60.
The 3D PI chamois isn't comfortable. The only thing I like in the PI line is the 3D Pro chamois but you'll only find those in shorts $130+.