my old chair mat never caused static electricity. This mat is made of a different material that must conduct static. Sometimes I get a bit of a bite when I touch things after rolling across the mat. I do also have a new chair so it could be the combo of both causing the static. You can't beat the price of this though.
I'm 6'2" 220lbs and already there are massive dimples in the mat...almost like dents will keep an eye them to see if there is any cracking or perferation in those areas...and keep my eye on the warranty and glad I used my AMeX card because it doubles the warranty...probably only 30days... I guess you get what you pay for
measured the carpet pile to pick the correct mat. if I sit in the same spot for a few minutes the wheels cause a dimple in the matt. it takes a push to get the chair to move. the dimples come back to a flat surface but not easy to roll around on.
This is a good mat and the price was right. But even on low plush carpeting it is a bit too soft. after sitting a while in one place the wheels tend to sink into the grooves making it harder to push away from the desk. I probably should have gotten a harder surfaced mat to place under my desk chair.