I posted this question a couple of months ago. At the time, no one who had subscribed responded. The only responses were that with FT you get the information anyway.

A few weeks ago, someone posted again and people who had subscribed said that they thought it was worth it. Non-subscribing naysayers reappeared as well.

With premium fares so high, it only takes one "find" to pay for the subscription many times over. At present, I just get his free e-mail.