I don't have an the new agent. I only have experience riding the old school, traditional camber, 2007 rome agent 155. So with all these new changes rome has in their new boards, my comparison might not be valid but I still love my old 07 agent.
Comparing the agent 155 to my proto 152...
the proto rides about the same length as the agent if not even longer. the proto is also much stiffer but i suspect this is because they make it a little stiffer for some added pop to make up for its rocker profile. i'm not sure how stiff the rocker agent models will be. I suspect that the agent board might be a bit more playful for jibs rails and park but the proto will be the better all mountain shredder of the two.
ohh and did i mention vario grip really fucking works...
Freeride/bombing trails: Proto
2007 Rome Agent 155, 2011 Rome Artifact Rocker 150, 2012 Never Summer Proto CT 152
2011 Union Contacts, 2012 Flux SF45, 2008 Rome 390's (Retired)
2011 Zoom Kaiju, 2007 Thirtytwo Prospects (Retired)