How often do you buy a new mat? I have had my first one now for a year and 3 months? I have a few groves in it. And also found a mat smoother. Have any of you used one of these before? I tried it and it took the batting out of the groves and seemed to smooth the mat some. By the way what have all of you done with your old mats just throw them away? I found the smoother at Hancock Fabrics yesterday.