I think the Redshift stuff is legit (and put my money where my mouth is).
How would something like a RedShift stem and a Canyon flexy seat post compare to the active suspension bikes?
Active suspension has dampening. Leaf-spring (Canyon seatpost) or elastomers (Redshift stem) or elastomer/spring combos (Redshift seatpost) don't dissipate via dampening, so they can pogo if you set them wrong.