> The only drawback I see is that it requires your attention, unlike say typing. But that might after all be a good thing.

I don't see how being distracting can be an advantage for an information entry system. It seems like it would just distract you from the content of the message. Care to elaborate? (I'm curious)

Edit: The other major drawback is that it limits your expression. Suppose for example that I want to write the word "Rhinocephant" (it's half rhinoceros, half elephant, and 100% imaginary). But if I want to type that with Dasher, it will be extremely difficult (because it is not in their language model). On the keyboard (or pen) the hardest part is deciding how to spell it. (Unless I'm wrong about typing imaginary words?)