I use a treesaddle for most of my hunting now. It offers me great mobility and no bars to fight (I've got a Gorilla climber that's very similar to your oldman climber).
That said, I make sure that I'm positioned so that my strong (bow) side is near where I believe the deer will show up - yesterday I had two show up on my non-strong side (release hand side), so I had to move the whole bow over my pivot point. Not terribly difficult to do, but definately awkward. My bow is 62AMO, but I'll be swinging by Merrill here shortly to try out a new 54" RER.
I have to laugh now when my buddies complain about they're 34" wheelies getting in the way of the bar...