My old mat, although slated to be optically compatible, didn't seem to be.
They are certainly comfortable to use and come with this sticker - the sort that always amuses me...at one angle the hand is placed so
and then when tipped a little more horizontally shows how the hand should be placed around the mouse.
I bought the mouse on Saturday, and not really used it much yet. From the reviews on Amazon people seem to be highly delighted with it ...or not. I shall see. I am trying to keep to my laptop and its touch pad at the moment to see if that improves things.