I think a lot of a blade getting dull is how it is used. If you put pressure on the blade to cut into the mat then the blade will get dull faster. A good cutter with sharp blade does not need much pressure to cut fabric. If you are pushing down on it to go into the mat and not stay on top of it then of course the blade will get dull. A weighted rotary cutter have enough pressure without adding any. Quilter's Select, Tula Pink, Ginghers are all weighted.