I have the two Olfa ones (12" and 17"). They are great and well worth the money.
Not long ago I questioned this board about replacing the top on the 12" rotating mat (
http://www.quiltingboard.com/main-f1...t-t181860.html). Happy to report that it worked! Had an extra mat and super glued it right over the top of the very worn out one. Worked perfectly and now my rotating mat is pink!