This is my 4th GelPro comfort mat; I purchased the 1st one several years ago.  I have it in the laundry room in from of the washer/Dryer (20X48).  Nearly 2 years later, I decided to order 2 more for the Kitchen (20X36).  
 A few months later, I had to get another one (20X48) to place in front of the island where I prepare most of our meals... It is AWESOME standing on this mat, so happy with my purchase.  I plan to buy several more in the future to put in front of the vanities in our bathrooms.  They stay flat on the floor and make standing more comfortable.

Having given all the praise, I have one dislike, they slide on the floor, not a lot, just enough to irritate me.  A bit pricy in my opinion but worth it if you have hard floors or discomfort standing. Overall I am very happy with all of them.