I was replacing a mat that did not have tapered edges. I love the taper on the new mat. However I am still running over sticky tape spots that occurred when it was rolled for delivery but didn't hold. (The mat was leaning against my house standing up and curling at the bottom). My biggest problem is the large about 8 x 11" paper at the lip. I expected to pull it off in one sheet. Instead it comes off in small pieces and leaves thinner paper stuck to the mat. I don't have time to pick at this stuff!!
I recently purchased a large desk with a separation and two openings for chairs. It sits on a 3/8" pile carpet. I bought one of these chair mats first liked it so I then purchased another identical one. I bought them on sale so it was a good value. So far they seem to be holding up well quality and thickness are adequate so I'm satisfied.