It's an interesting idea. It's also only so useful at the moment, given that it's propeietary. I'm also not convinced about using a smartphone as your only throttle choice. I'm definitely in the camp of "tried it prefers mechanical dial". Of course, there's nothing to stop someone from building a hardware Bluetooth controller, but so far there's not even mention of such a thing. It will be interesting to watch it and see if it takes off.
