Yesterday, when I talked about American's new pricing tool, it didn't produce any results for me. Today, it seems to be working.
Chicago to San Francisco, August 20-24, costs 26,000 miles using the dynamic tool but 32,500 miles using the regular tool. Searching September 3-7 got me to 25,000 miles through a regular award and 24,000 miles dynamically.
So, no really huge savings (at least with my pathetic sample size), and you have to use both tools simultaneously to see the deals. Also, their regular tool allows you to look at an entire month of prices at once.
I hope the tool improves. It's a great idea, but it's not really ready for the world yet.