Has anyone heard if the Salem Cutting Mats by Southstar Supply Company are any good? I did read a comment from one of the members and looked it up. The only reason I ask is because I need a new mat and it has to be shipped. This company claims that a rolled up mat will flatten back out by using a hair dryer and they will not warp. I love my Olfa mat but I need a new one as the one I have is warped on the lower edge of the mat. I am afraid to order an Olfa by mail for fear it will be warped and I will not be able to fix it.