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IPSec VPN Throughput on 3825 routers - benefit of AIM-SSL-3?

Our corporate network has two remote offices, connecting via VPN to a ASA5515-x located in the data center.  Initially both sites were single ISP, however both are now getting secondary providers without the option of BGP.  Each office has a Palo Alto 200 firewall pair, which support OSPF and BGP.  My plan is to re-purpose two 3825 routers as the new VPN hub, and build parallel site to site tunnels via each ISP, then use BGP or OSPF to load-balance across the tunnels as required.

Reading this doc: it says the throughput for a 3825 is 170 Mbps base and then 175 Mps with AIM-VPN module.  Is this correct?  If so, why would someone buy the module only to get a 2% performance increase?   Can someone offer firsthand experience / read world numbers so I don't have to lab?

As a side note, I also have two 2921s sitting around, but they lack the security license and wouldn't be much faster than the 3825s regardless.  



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