Discussing Microsoft Forefront security attempt

Hi Guys

We have long used netcache as our web cache and deployed inbuilt 
websense/webwasher for content filtering. Now is the time to move on for the 
product is old and no longer suppported. Had a look at Bluecoat but that's 
prohibitively priced.

I was starting to wonder, how about shifting into old Microsoft camp? They 
are starting to market their forefront security in a pretty big way. has 
anyone tried their hand on it? ISA Server 2006 promises a good proxy but I 
wonder if it can do content filtering. Somewhere else they have mentioned 
"Microsoftâs Intelligent Application Gateway (IAG) 2007 with Application 
Optimizers provides secure socket layer (SSL) virtual private network (VPN), 
a Web application firewall, and endpoint security management that enable 
access control, authorization, and content inspection for a wide variety of 
line-of-business applications." ISA Server 2006, combined with IAG 2007, 
serves the need for network separation and full control of inbound and 
outbound content and adds significant edge security functionality to address 
a broad range of Internet threats.

http://www.microsoft.com/forefront/edgesecurity/iag/overview.mspx

This sounds cool in words. I see a huge savings for we already hold 
Enterprise Agreement license from Micorosft but I was wondering, if spending 
time to explore these technologies, would be worth it. The current need is 
to have an affordable content filtering/web caching solution in place.

Any suggestions?