I am looking for a VM appliance Next-Generation Firewall. So far the only one I have looked at is the Palo Alto VM-100. I am still waiting to get my hands on an evaluation to see how it really works. I am wondering what else is out there that is very good and maybe not quite as expensive. I found a Comparative Analysis from NSS Labs, but it is $3,500 if you want to read it. 
https://www.nsslabs.com/reports/next-generation-firewall-comparative-analysis-2013
https://www.nsslabs.com/reports/next-generation-firewall-comparative-analysis-2013