Imagine how much better your life would be if your home was a little bit larger and all your commutes were a lot shorter. That's what typing with the Text Blades is like. Your fingers have all the room that they need while sitting on the home row, but they have much less distance to travel when they need to move.
More room, less reach.
Unfortunately, this means that for the first few days, when you're driving, as well as saying, "Wow! We're here already!" you've also got too many occasions when the kids in the back seat are complaining, "Dad! You went past it again!"
In my limited experience, the biggest problem that the Text Blades face is not performance or connection issues — so far, the connections have been no worse than with any other BlueTooth keyboard — the biggest problem is that typing on it doesn't feel natural for a day or two. I think many users, trying it out, won't distinguish in their own minds the difference between keyboards where the keys aren't where your fingers expect because all the keys are too small and a keyboard where the keys aren't where you expect because there's less need to reach.
I think it will be important to proactively shape how the user perceives the keyboard by 1) drawing attention to the full-sized keys and the difference between room and reach (as some of the website videos do well), and 2) having the users' first experience be not free typing, but responding to a script that emphasises comfort on the home row and easily felt advantages such as the ease of using numbers in the green layer and then maybe humorously points out how their pinkies in particular might take some time to adjust.
I'm less than a week in, and I'm still making lots of mistakes, but I'm really liking how it feels to use. I wrote to Jennifer in reply to her request for setting up a time for the phone call walkthrough, and suggested they should consider postponing my call and instead called for all hands on deck to stuff mailers for a General Release…. I haven't heard a reaction to my suggestion yet.