Good quality, but slips
Your review: My guys really like have a good mat to stand on concrete all day long and this one fits the bills just fine. The only, and I mean only, small thing is that the tiles can move on the floor a bit when there is repeated stepping on and off the mats. We have them in a 4x4 grid and after about an hour we have to slide them back into place. Not a bunch of movement, but enough. Going to try skateboard tape on the bottom to see if it can provide enough friction.