I like my Olfa ones and have noticed that most quilt shops use Olfa. I have one small June Taylor and it is a harder surface.
Interesting note: My LQS people try to vary where they cut their yardage - not always on the 18", 9" etc. I asked why and she said they are trying to make their mats last longer. If you always cut on just 9/18/27/36" etc - then those lines wear out after a while.