Plenty of things on the market. The #1 thing Cisco has going for it is excellent support which many of the others DO NOT.
Good point. When you are looking at solutions you will also need to ensure that you are not limiting the rest of your environment. For example, if you need to deploy something like Websense for rule based URL blocking it will only integrate with a limited number of firewall solutions.
BTW, I'm not advocating that anyone should deploy Websense - there are other solutions on the market.
