I purchased the mat to replace my prior mat that I had for five years. The older mat required replacement due to breaking and chipping due to wear and tear. This mat appears to be more malleable than the prior mat and may hold up longer than the prior mat. If you sit in one spot for two long the mat will develop dents where the casters are. However it appears that when you move the chair away the dents do go away as a result of the malleable material. I have seen no issues with moving my chair around on the mat. I have currently had the mat for about one month.
It's a good value for a small space. This mat isn't huge but for a small space it does a great job. Chair rolls smoothly over it and it does protect the floor without calling attention to the mat.
Store employee was quite helpful in finding me what I was looking for. I have no complaints on my purchase -- it served just the purpose I needed it for. I may shortly duplcate it. The price sold me on it. Also I do use it over thick carpeting (no padding)--and all seems fine.