Seems like an awfully high price for something that would be fairly trivial to accomplish with an AutoHotKey script. I can appreciate the ease of downloading an app ready to go, but $99 seems really high.
There are a handful of simple AHK scripts based on the same concept, but that make you hold a modifier key such as [space] to identify which key you want. The advantage of my app is that determining the characters is all done naturally and automatically via predictive-text as you are typing. Much more in tune with your muscle memory and faster and easier to learn as a result.
P.S. One of the most well-respected members of HN sells a self-described "Hello World attached to a random number generator" for $30.
