Although the ROI is difficult to calculate for NAC in the general case, some hard savings can be assessed in specific cases. For example, a customer of ours reduced the workload of its help desk staff by 15 to 20 percent by having more consistent PC configurations and updates. This saved the company $40K annually, which was enough to cover the cost of our NAC solution.
Stacey Lum
InfoExpress
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NAC in general
Part of the slow uptake of NAC can be attributed to the fact that it is often a solution in search of a problem. The 'Health Checks' generally rely on your installed AV software. If the visiting machine has a virus that your AV does not detect (sadly common), the infected machine is allowed on the network. If your AV does have a signature, the virus would be unable to spread anyway since the other workstations would flag it as such.