I'd buy for weight savings really. Nobody shatters theirs or grenades the rear diff because the PTU goes out first. I still don't know how comfortable I am with that thing even with the upgraded caps.
But that looks hella cool. Wish they woulda been around when I ripped my DS apart.
In the FDs we found the driveline shocks was a bit less with the carbon driveshafts and there was less drivetrain noise. Not sure if it is worth the cost though.