Supprisingly good.
Although I only had them for a month I was able to setup some fairly intense rules. I've been working on firewalls for almost 20 years so it was fairly straight forward to figure out. I setup a nested groups of users, services and applications to put in the rule base. The performance does drop, but compared to the degradation of going through a web filter and a firewall, it was fairly comparable. As I stated, the product was just making it to market. I'd love to get my hands on one now!