It wasn't hard or heavy to deal with the teeth weren't hard to get up from the carpet when I initially put it down so if it was in the wrong space I could easily move it. Once I got it in place it was very good and fit the purpose.
The mats are good after a week or so of use. However they arrived rolled up in a box and took a long time to flatten out-- overnight with weights then under the desk chairs. These should be shipped flat. Other than the initial difficulty they are great-- they look nice and seem very sturdy.