I used it at DCA two weeks ago. It took TSA an extra minute or two because the first scanner didn't work. Once scanned, the agent pointed me out to another at the metal detector that I was using the paperless boarding pass since the blackberry still goes through the x-ray. At the gate, I scanned the blackberry myself to board.

On the return from IAH, TSA's scanner worked on the first try. No probs at the gate either.

Nice to be able to go paperless.^