Guys,
I disagree with some of the comments posted here.
The S6040 and S4000 are 2 entirely different product lines for 2 entirely different segments. S4000 is an excellent low cost solution for Ethernet, WAN, ATM, Gig etc. networks, whereas S6040 is a higher cost solution with much better performance, on Gig Networks.
As tmbenne said, S4000 will do just fine on Gig, provided you do not need capture at line rates for high utilization rates. This is where S6040 comes in.
Typically, one would put S6040 boxes at the core of one's Network. It has excellent performance and advanced filtering capabilities. Based on my information, there it even has some kind of aggregation feature that allows you to consolidate data from up to 4 links.
This 6040 solution would get even more attractive once NAI comes out with the Windows console or the SniffView console, as we know it - I heard that this might happen sometime in 1H 2004.
Until then, customers may face some issues at the console, but they should be more than offset by the impressive feature set of the Agent.
TmBenne - maybe you can ask your NAI SE / support contact to help you out with some of the issues you are facing and help you get the maximum bang for your buck.
My 2 cents,
MP.