This mat is not working for me like my last 2 have. The prickly side is less effective than my previous ones. It does say that it is for flat pile carpet. It walks on my carpet so I guess my carpet is too thick. I bought it because it was the only one available at Staples. I need a sturdier mat. It probably works fine if you have really flat carpet.
A lot better than trying to roll right on the carpet but after sitting it one spot a while it does allow the casters to sink enough that it takes a little effort to move again to get it out of the "ruts" After you move then the mat will eventually flatten out again. Overall I'm happy with it. I do like the fact that it is made in USA.
The plastic does it's job in allowing you to move freely but the problem I noticed is if I sit too long in one position little divots form in the plastic and I am almost stuck in a pothole. It's the quality you get at the price you want to pay. That being said the plastic is not thin or flimsy so if you're more up and down than this might work for you.
Excellent quality; a bot more pricey than competitor yet I feel the quality i.e. sturdiness and fit is very good. The ordering was easy and delivery was w/in two days. All great!