This is an amazing little device, I have yet to reproduce it but I definitely will do so this year. The main reason I want one is to be able to serve as a 'stepper' for tiling stuff under a microscope. The repeat accuracy of this thing is uncanny and the fact that it can move in three dimensions (rather than two, which is the norm for a microscope) means that it will be possible to keep the object in focus even if it has some thickness.