I like the this keyboard, it just needs a couple slight alterations. My complaints are pretty much the same as everyone elses; the keys are too small and the letters should stand vertically on the keys to make it easier to process them. My other complaint is that it might help if the whole keyboard were moved over just a bit. I get that its supposed to be for one handed use, but the keys closest to the side of the phone are kind of difficult to use one handed. At least for me. Its just a little uncomfortable because my thumb is all squished and tweaked if Im trying to hit the delete, return, caps, etc.
The idea of this keyboard is really great though!