After reading this thread, I went and looked at my mat - I really had no idea what kind it was.
It says "June Taylor." I'm guessing I got it at Joann's, it's about 7 years old. The last 6 mos or so it once in awhile leaves a thread or 2 uncut, and to be honest, I have not switched my blade in 3 years or so. Now, I don't do a huge amount of quilting, but I think I do a lot.
Does anyone here want to share their experience with this type of mat?