You can calculate it for yourself with a few simple spin tests involving this magic number...
Show Image
(http://flexgraphix.com/blog/wp-content/uploads/2009/04/how-many-digits-of-pi-do-you-know.gif)
I actually attempted to do that with the Expert Mouse before I wrote this post. I used a FPS (http://www.notalent.org/sensitivity/sensitivity.htm) and circle/sphere (http://www.csgnetwork.com/circlecalc.html) calculator along with some craptacular reverse engineering. I came up with ~800 DPI for the Expert Mouse under Mouseworks. I have yet to try this using the Trackballworks beta, but the DPI does feel different. I am not sure if this is intentional or not so I am loathe to do it again. To be honest, I was hoping for an official source to confirm/refute my findings - hence the thread.
That is a great image by the way. :smile: I believe I only used two decimals in my measurements.