Great idea, terrible execution.
Not only do you have to press the letters multiple times to get them up, but the actual keyboard takes forever to load and sometimes it blocks the keyboard from even showing on the screen. (The second I deleted it my regular keyboard came right up). I wanted to like this for the Pantone colours, but its not worth the constant hassle.
Broken profile about
Brightkey Keyboard - Designer Themes, v1.2.3