I bought this because two other family members have the same type of mat on the same time of carpet as me. I have owned it less than a week and I have had it slide on me over 20 times even though I have a heavy desk on top of it. I guess one side of my heavy desk is not heavy enough. I am weary of always moving it back into place. I should have bought a mat with spikes. By the way this was not shipped in a box. It had a delivery sticker on a flat plastic mat. Easy to remove the sticker with no residue at least.
I have done reviews and surveys already. I have only 1 purchase; if you keep after me for reviews and surveys repeatedly this will be my first and last purchase. Enough already.