I'm not a big fan of the Vantage seat, mainly because I really enjoy sitting over the side of my kayak and the arm bars prevent that.
I have a 2012 model now, and the only reason I would upgrade to the 2013 is for the sake of the Lowrance transducer mount. Has anyone tried to put the old seat on the new model?
If I can get my hands on a 2013, I'll try to butcher it up and see what I come up with.
There are a few posts showing how to modify the seat on a Pro A and some allow you to swing and move in any direction.