Does what it says it will and does it surprisingly well. I have it pinned down under the legs of my desk and I haven't had to adjust it once in the month I've owned it even though I'll often slide off the edge and back.
I just ordered my 3rd of these mats in 12 years. I work from home and my desk chair is on the mat moving around 5 days a week 46 weeks per year. Replacement every 6 years is great. Plus the ease of moving around on the mat is wonderful. I highly recommend!