I am a Swype user and love the product, but I'm reasonably fast at typing on it because I know the QWERTY layout like the back of my hand. Switching to a new layout would bring me back to a crawl. I'd probably be better off typing on a 9-digit pre-smartphone keypad at that point.
Cool things to consider though. I love the idea of an alternate and more efficient keyboard, but at around 140wpm, the idea of mentally and physically training myself to learn a new one at this stage in the game is sub-optimal.