This plasic carpet has tendency to travel. That is the carpet even with the backer cleats moves one way today and another way the next day. I've had to use screws thru the plastic carpert to keep it where I want it
I have had this mat for a couple weeks now and it is doing quite well so far. I like the fact that it does not have the sharp pointy spikes on the bottom but rather the flatter jagged edges. I have it on a thicker style wool rug and it stays in place nicely and also does seem to stay pretty rigid after sitting in my chair for a long time.