I used to prefer Olfa, but can't handle the smell of them! Have had a fiskars for several years now. Yellow and green. Works great unless I decide to be really cheap and not change my blade! Works great again after I change it. I use a Martelli ergonomic cutter. At one place where I have a quilt group, they have a purple mat that we use. My cutter does not like that one! Hope you solve it! Ann