Smaller than I expected have about 1 foot of rolling space front to rear under my executive chair. There is about 3.5 inches on the left and right if the chair is centered. It is plenty adequate since I don't roll around too much just have to be mindful about rolling away from the desk. Quality-wise I don't see any cons. Protects the wood floors from my chair's casters.
I use this in home office on short pyle rug. The office chair rolls easily and the carpet is protected. Static is not too bad. I had same or similar one for about 3 years before this and it began breaking up into pieces under the chair rollers. I hope this one lasts longer.
My last computer chair pad cracked beneath the rollers. It was too thin for the berber plush rug. This pad is very sturdy. Hopefully it will hold up well.
Not too big not too small it really does have a nice feel to it and is stiff enough for easy rolling without being hard or brittle. Just what I was looking for.
We used this product for under child tables for childcare - works very well & will be durable for this application. I would agree with other posts that these would not work well (or long) with adults on chairs as they are too thin to withstand that kind of pressure. Then again they are half the price of 'good' ones so you do get what you pay for!