New front-loading washing machines spin at a higher RPM and have more vibration associated with them. If your washing machine is on a concrete floor, the only problem may that your machine "walks" a bit with this vibration -- which can be a troublesome problem, no doubt. But -- if your washing machine is on a wood frame floor (like mine), you may not only have a "walking" problem, but the floor and wall joists can vibrate. Over a period of time, this can cause structural damage.I recently purchased a front-loading washing machine with anti-vibration technology -- but sad to say, on a frame floor, it still vibrates and shudders (with multiple professionals balancing the washing machine feet to make sure it was as balanced as possible). Despite the noticeable vibration, this new anti-vibration technology does help (way better than my old front-loader) -- but the vibration physics of a higher RPM on a wooden floor is hard to completely overcome. This is particularly true with a large washing load or a poorly balanced load (an unbalanced load is hard to tell ahead of time). I did try several different rubber floor pads (applied to the feet of my washer) which did help the vibration, but my washing machine had a tendency to "walk" on these elevated pads. So -- that was not the full answer.At this point, the solutions become a little more challenging. If you can re-inforce your wood-frame floor, this is ideal. I was able to re-inforce my floor joists because I have a basement underneath -- and this did help some, but the vibration remained noticeable. My washing machine sits on a lineoleum floor over "inadequate" plywood. I was not particularly excited about tearing my linoleum out, putting in additional sub-flooring of at least 1/4 inch (which is ideal and I can see that this may be required for some homes and some washing machines) -- so I tried this 3/8 inch mat as a matter of last resort.For those who are trying to tamp out vibration on a wooden frame floor, this mat should be given serious consideration. The mat is heavy (40+ pounds) and does not move after being placed on the floor. Getting the mat underneath a washing machine is serious sweat equity, but this mat works. I am very impressed. I can sit in a chair in an adjacent room and read the newspaper while the washing machine is in spin cycle. My utility room cover doors no longer rattle. Everyone is happy. This mat does the job very nicely -- and I learned alot in the process!