OpenVPN access server on Amazon VPC vs free version

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http://serverfault.com – Maybe I'm missing the point, but I'd like to setup simple VPN access with software VPN to access my private network on Amazon VPC. I thought OpenVPN would be a great solution for this, and I thought it might make sense to put this on the NAT instance that comes with VPC so I don't have to spend money on another instance. Is there any advantage to running the following: http://www.openvpn.net/index.php?option=com_content&id=493 vs sticking to the free solution of OpenVPN? What does one offer over the other? Any reason not to run this on the NAT instance itself? (HowTos)