I love the GelPro mats. I have two, end to end, in front of my sink and prep area. My feet and legs are much more comfortable when I stand on the mats. The colors are perfect in the kitchen. I liked having color choices and was delighted to find one that is so pleasing. 
The corners are easy to attach and stick to the floor, but I am finding the pad shifts a bit, so I'm trying to determine the best margins to prevent the shifting.