Features and Comfort:
When starting the MIT Wearable Computing Project, I issued every member a Twiddler as their primary text input device. With starting another group at Georgia Tech focused on wearable computing, I've just placed an order for 10 more Twiddler 1's. We've seen typing speeds of 60 words per minute, and an undergraduate has reported speeds up to 30 words a minute with only a weekend of practice. More generally, new users can learn the alphabet in 5 minutes and can be touch typing in an hour. Though it takes time for the fingers to "loosen up" to accomodate the new motion (much like learning to play an instrument or learning how to type on a desktop), many new users are up to 10 words a minute with a weekend's worth of practice, and current non-touch typists remark that it is easier than learning the desktop QWERTY keyboard.' "
"I'd like to say that I have been very happy with the Twiddler. I've been tinkering with wearable computers for some 15 years now, and never come across a better input device. I've designed and built a number of input devices from microswitches and the like -- before the Twiddler was being manufactured, but I really do like the Twiddler, despite its 1 or 2 shortcomings. It gives me the same sense of tactile feedback that I get from a high quality microswitch, enabling me to control various kinds of apparatus without my needing to pay full attention to the screen...If you need any ``testimonials'' from an experienced tinkerer, designer, builder, and user of wearable computing, I'd be happy to recommend Twiddler to wearable computer users, over and above voice (or certainly at least in addition to), eye movement trackers, and all of the other ways of controlling computers or external devices."