i purchased this mat because i thought it would be stiff enough to not allow sinking. unfortunately my chair alone creates divots in the mat. with my 200lbs and the chair needless to say once i'm seated at the computer i do not move nor can i roll around from one station to the next. i was concerned when it arrived fedex rolled up. it is a good product just not as good as i thought it would be.
I received the mat as scheduled. However the delivery man just handed it to me with out a box of any kind. After putting the mat on the floor I noticed it was filthy and had several areas of tape residue. I had to thoroughly clean it with GooGone and spray cleaner.
Chair mat with ramped edges is perfect for use with my desk on low pile carper. No more struggles moving the desk chair around. The mat holds tight to the carpet no shifting.