Is this guy real? I'm not sure. I'm 50/50. I can argue a great case of both sides. Also, which is better? Somebody like him or somebody that would waste time putting up those reviews.
One for home and one for work. I've been using them for years. I tried the 4000, but I didn't like the feel of the space bar which is the key you use the most by far.
Watson was written in mostly Java but also significant chunks of code are written C++ and Prolog, all components are deployed and integrated using UIMA.
P.S. View source.