We bought this mat for our home office to use over standard residential carpeting in what was designed to be a bedroom. The mat works great so far and looks like it will hold up to regular use. We bought it for my husband's chair so the combined weight on it is likely to be over 230lbs. It was delivered without a box laid flat outside our front door and everything is fine. We are pleased with our purchase.
This chair mat works fairly well but the wheels on my chair leave dents making it difficult to roll the chair around. My carpet is very low pile and our other chair mat holds up better.
The mats do what I needed at a good price. No they are not as stable as those costing two or more times as much but they cost two or more times as much as do these. So I'm happy.