The optical link is novel indeed. Having worked with magnetic encoders in a noisy environment, I would have loved this as an alternative. Light is not electrically sensitive. Also, removing electronics from the business end of the setup is sure to keep noise to a minimum.
However, the price surely reflects the innovation. A setup like this geared towards the home machinist or small business would certainly clean up.
Linear guides are one of the most important components required for the design of automated or computer-controlled equipment. Aluminum profile extrusions, used for these guides, can enable designed-in functional features.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.