Ron

You wrote,
"None of the commercial anti-spam solutions is as plug and play as you would be led to believe."

And the one comment to this article said,
"It took nearly 4 days of near-constant attention to mark spam and ham. Since them, my intervention has been limited. The header, subject, and body filters need to be added to."

This doesn't sound like "plug and play" at all. It sounds like "train for 4 days" and "write rules periodically". Have you tested the other appliances you said weren't "plug and play"? I'm not sure setting users' expectations that this is the best they can do is accurate or good advice.