I had a 3-year old Mx510 mouse which still worked perfectly, but had a couple of "feet" worn off. I inquired to their warranty department, "do worn-out feet count for a warranty claim"?
They said, "We don't have an feet to send you for that... and we don't have any Mx510s to replace it. How about we send you a brand new Mx518?"
Can't beat that!
They said, "We don't have an feet to send you for that... and we don't have any Mx510s to replace it. How about we send you a brand new Mx518?"
Can't beat that!

