I replaced a hard mat and am a little disappointed because the chair makes indentations on the mat and is not as easy to move around. I would have preferred a hard mat.
I consider my office carpet to be low pile but the chairmat is soft enough that the wheels sink into it. This is probably the case for any chairmat at this price point.
This product has worked well for me so far. The only thing that was unusual was that the mat was not boxed for delivery (it just had a sticker with the shipping info) but in the end it still arrived in new condition.