That helps some, but I don't buy into the "one hour to adjust". I would never say I "adjusted" to the TB in an hour even though I could certainly type with it. I think you have to be pretty close to your normal speed to say you truly adjusted. But then, what are they comparing it to? Most people don't type very fast on phones and tablets so if that is the comparison, the catchup time will be less than on a computer with a normal keyboard for touch typists anyway.
31 keys must have some combos reserved for changing things. Like maybe one to switch to numbers and another for symbols.
I note the claim of 99% accuracy, but if the device itself is making errors 1 time out of 100, that's significant when added to the user's own errors.
But I can see how it would be good for some special cases.