I bought grey rather than blue because I find it easier on the eye. It is grey not light blue as Dave's new mat appears to be. Hey, each to their own! I did, however, pay for the same type of mat that Dave uses as I wanted something more resistant to damage than my previous mat used in computer field repair.
I can understand widths of 914.4 and 900; but why 910? There has to be some logic.
As far as cutting Dave's new mat I would have advised double sided tape at the back of the bench and cutting there leaving the front visible edge factory cut; doubtless, this is way too late now.