We had some timing issues with PIX integrated WebSense
on PIX OS 6.3(4) and earlier, so we upgraded to 7.0(1).
Besides the extra functionality, it fixed the timing
issues with WebSense. I won't go into detail, but
you will need to research which platforms version 7.0(1)
will work on, and if you need any extra memory requirement.
So, bottom line.... PIX and WebSense work quite well
together. Only negative is the high cost of the filtering
subscription. A 3 year license will defray some of the
cost, and WebSense tech support was actually able to
tell me how to tweak my address space so I could use
a cheaper license (fewer users).