Just going by what I was told when sitting at the table with the directors of R&D and product marketing for Cobra Puma.
Looking at my notes again it was said the PXv was proprietary and performs incredibly well with the head including when Rickie got to test the Bio the first time. The Red-Tie and all other offerings for the Bio+ are aftermarket shafts and not proprietary.
In the end who cares, if you hit it well. I hit it phenomenally in an R flex when my SS is well beyond what's considered R territory (which is bunk but I digress). It's a way better designed shaft than last years fuel proprietary was for the cell, zero doubt in that. Damn good setup as stock for a lot of golfers.
agreed, its a great shaft, definitely much better than last year's fuel.
hope my post didnt come off the wrong way, I had just remembered seeing that video awhile back.
guess that guy needs to go back to cobra school!