I have bought these mats before (different products) and they all work fine at the beginning. It will take a while to see how the mat stands up to normal wear and tear.
I have bought this product before and I Have been very happy with it. I will continue to purchase this product in the future as the saying goes..."if it ain't broke don't fix it"!
This chairmat is a little different from the three others I have tried ... the carpet grips are rectangular not pointed tacks. Will this make a difference in it longevity? The jury is out. I hope that it last longer than the 18 months (or less) the previous three prevailed before beginning to crack chip and disintegrate. I am not so concerned about the "beauty of my office carpet showing through" as I am in the chairmat's durability. Check in again in 17 months and I'll let you know if this is just another product with planned obsolescence.
Haven't had it long seems to be a typical chair mat. You should know that it is shipped flat and unpackaged and the shipping label is stuck on the smooth side with REAL GOOD glue.
This works for our computer in our home. It stays where it is supposed better than other I have used. I liked it so much I bought another one for under my exercise work bench and it works wonderfully there also. Then put it under my exercise bike because we had new carpet put down to keep the bike up off the carpet in case of any rust and is also great for that. Don't have to mess with other objects like rugs to keep them in place and covered for protection under the exercise equipment.