A friend of mine used to work on sensors similar to what mice use. His biggest argument against these "ultra high DPI" laser mice is it is worthless for 99% of users. The problem isn't the mouse, it's the mousepad itself. The mousepad is typically a fabric, that doesn't look much different to a mouse at 1000 DPI than 5000 DPI. How you could possibly claim a 5000 DPI mouse is better than a 1000 DPI mouse with a regular ol' mousepad is beyond him. I'll agree that he doesn't have all the answers, but does anyone know of any scientific tests performed to prove that the DPI really does matter? I give more value to empirical evidence than someone saying it works better. Someone just telling me they like the mouse doesn't cut it for me. The placebo effect is much stronger than many people realize.

I have a Logitech Performance Mouse MX(uses darkfield laser tracking technology). I haven't seen any mention of DPI on it or with any documentation(I have to wonder if this is because the DPI argument is all about marketing). I do know that the mouse seems to track the surface much more effectively than any other mouse I have ever owned. I literally can put the mouse on my hand using my palm as a mousepad and the mouse tracks perfectly. After doing that quick little test I found the mouse worth every penny. With other mice they have a hard time tracking an oddly shaped surface. I actually bought it to use on my glass coffee table when sitting on the floor or on the arm rest of my leather couch when sitting in my couch(HTPC for my living room). I'm not entirely filled in on how the darkfield technology works, but I find it tracks the surface of the mouse better than any mouse I have ever used.