XSReviews has reviewed the Nova Overslide mouse mat
A quote from the article:
>> Nova Overslide Review
Nova recently impressed us with their Slider X mouse, though it had it's few annoyances. Now the company has been kind enough to send us the accompanying mouse mat, designed specifically to improve the Slider X while working well with others too. Containing "Ceramic Micro Balls" and a flip tone surface, will it impress as much as the Slider did? Let's see.
>> Nova Overslide Review