What, Tom, you sitting? That'll be when BOTH of our heads are as smooth as our helmets.
I've only worn a bosun's seat once, and from the get-go it always reminded me I was sitting on a 2x4. Maybe its just my physique (hard butt?).
On the other hand, I did have a few climbs in a TreeFlex where the harness became transparent, as if the ropes terminated right into my body some where. Similarly, after the 3rd time the TreeMotion was tuned to me by Chris Cowell.
There is something to be said about this sort of innovation. I can be safer if I don't have to pay attention to comfort. Pay for it now, or pay for it later.
YMMV