I've been using two of the black, 17 x 38 mats on a 70+ year old, hardwood kitchen floor for a little over a month at the time of this review. One is in front of the kitchen sink, and the other in front of a cutting table.WHAT I LIKE:- They give relief and feel good on legs, feet, and ankles when standing for an extended period.- Their beveled edges don't catch, and foot shufflers (like myself) slide over the edges an onto the mat.- They stay in place and don't "wander" during use.- They catch inevitable sink water spills and cutting board escapees.- They're easy to clean and air-dry quickly.- They look good (to my eye) — they're unobtrusive but a step above "just plain."- They arrived rolled up but flattened completely after a day or two of use.Whay I Don't Know:- How well they'll last over an extended period.- How they'll stand up to strong cleaning chemicals (e.g. bleach, peroxide, alcohol, or ammonia.)These mats seem like "keepers," and the best item I've bought on Amazon in a while. I might even try the larger sizes in an institutional setting, since institutional kitchens typically clean mats separately when they scrub the floors.~ fwhI recently bought a standing desk, but quickly realized that bare feet on a hardwood floor standing for long periods of time does not work. So I bought this anti-fatigue mat. While I think it could be a bit thicker, the current thickness works well and has made my standing desk useable and stability is not an issue either. This mat is perfect for my needs.I am so happy I bought this. I spend a lot of time in the kitchen cooking. My feet get sore easily after working in retail for 15 years wearing awful shoes. Any comfort I can get at home doing something I love is well worth the investment. Super cushiony. I ordered a different brand and they did not come close to this one!My only complaint with the rug is that it is only 17" wide (I'd prefer it to be a full 20" wide). Aside from that, it cleans up well and is comfortable to stand on.I use this mat when I use my raised desk for work. It does help relieve the pressure off my knees when standing to work. The mat is also easy to store away when I need to rearrange my work area.I love, love, love this mat! I love it so much that I ordered a larger one to put in my kitchen.I really like that this mat provides comfort when I stand near the stove. It seems to keep my back and legs from hurting as badly. The material is easily cleaned. However it is thinner than I thought, and the color is a deeper red than I wanted. But, I am still enjoying it.Great mats! It's dark grey and not the same shade grey in the photograph.Not as soft as I thought it was gonna be. Go-to Costco and get one cheaper and more comfortable. I'm returning the item