I have a corner desk and it could be about 6 inches wider on each side. Adequate for stationary work but I can't roll far without falling off the edge.
The Pros and Cons of this product have already been mentioned above! It's basically a good product which wears reasonably well and is priced competitively. Enough said!
I purchased this to see what impact it would have under my desk chair. It clearly turned out to be a cheap intermim step to a custom wood mat with significantly greater thickness and durability. This unit is economy rated; the chair does leave dents in the mat after any prolonged position of the chair.