That was my experience in terms of shaft durability, but some guys had issues with the Deep 6 ferrules breaking and various issues with the half outs/outserts which seems like a step backward.For me, I like having a thicker carbon wall – seems to be a touch more durable. But I'm fine with 5mm as well. I know how to tune, so I just tune whatever I'm using and put something sharp on it. I've seen some chatter about oscillation and stabilization, which sounds like nonsense to me.