Another "alternative" has appeared. KeyMouse looks interesting. The major reason I started using Touchstream is because constantly reaching for the mouse or trackball caused arm pain. KeyMouse solves the same problem.
I love how the keys are aligned vertically, the keyboard is contoured for easier reach, and the keyboard is split for each hand's comfort.
I like how there are more keys accessible by the thumb; but those thumb keys look way too small.
I worry that the KeyMouse keys will be cheap with poor response. And the other Kickstarter project, Haptix or Touch+, mentioned in Fingerfans failed. And, of course, KeyMouse does not have the wonderful gestures that we Touchstream users love so much.