Apart from the limitation of key length (imposed by the maximum length of SSID allowed), this method will expose the plain WPA password on air. This is very disappointing coming from TI calling it "smart". But what is worse, is that SparkFun's Spark Core which is a few hours away from meeting its kickstarter's deadline describes it as "game-changer for embedded WiFi". Certainly changes the game going backward in WiFi security.