Product review (1 stars): BUYER BEWARE: more expensive  better product
I have a stacked LG washer/dryer on tile on my first floor. The vibration during the washer spin cycle transfers to the floor and walls of my entire home  in fact it transfers all the way up to the second floor, making the window in my master bedroom rattle loudly in its frame. Aside from this annoyance, I worry that it can also cause damage to the studs and floor joists of my home. So, I've been researching and working on a solution for about the past year.

First, I bought the Vibrafix rubber feet sold on Amazon. If you're on this page, you've probably already seen it  it has a lot of positive reviews. The Vibrafix feet reduced the vibration upstairs slightly, but the window still rattled audibly.

Second, I re-leveled the washer. The machine was technically already level, but I figured the vibration might be reduced if I improved the leveling further. I didn't notice much of a change after leveling.

Third, I bought this Rubber-Cal Anti-Vibration Washing Machine Mat. I really wanted it to work  it had a handful of 100% positive reviews, including one which described a stacked washer/dryer on tile just like mine. At first I was hesitant since it was so expensive ($93 for a rubber mat??), but I figured that it was a small price to pay to protect my home and that perhaps it was made of a better, more durable material than other rubber mats.

The pros of this mat are that it is made of heavy duty rubber that won't shed. It is very dense and heavy, and it will probably last a very long time. The mat was not as elastic as I expected (I can barely cause any depression when I pinch it between thumb and index finger), but its weight made me hopeful  I thought that the high mass alone might absorb and dissipate most of the vibration. There is a strong "new tire" odor, but I followed the advice of other reviewrs and was able to eliminate it by letting the mat sit outside for about 6 hours.

I cut the mat to size using a measuring tape, metal straight edge, chalk and a box cutter/utility knife. Like another reviewer noted, scissors will not do the job. You need to slice the mat along the same line (against a straight edge) over and over again, in layers, until the knife finally breaks through to the other side. If you use this technique, your cut will be perfectly clean and straight.

Getting the mat under the stacked washer/dryer was a bit of a pain. You can't just fold the mat, tilt the machine to one side, slide the folded mat under the raised legs, and then tilt the other way to unfold. The mat is so thick that it doesn't fold flat enough to fit under a tilted machine. You really need a dolly or some serious human lifting power, depending on the space your washer/dryer is in.

I just did my first wash load on the new mat and was utterly disappointed. Somehow, the mat has made the spin cycle vibration worse. I'm not sure how this is physically possible, but the ears and eyes don't lie  after all of the expense, cutting and lifting, my upstairs master bedroom window actually vibrates worse now. And the railing on my stairs has now started vibrating with the spin cycle.

I plan on troubleshooting and experimenting further, but it's hard to articulate here just how disappointed I am. I took a risk on a product that had few reviews and I paid the price. I've lost about $90 on a sub-par product that I can't return because I've already cut it up. In fact, unlike other anti-vibration mats on Amazon that are pre-cut to the footprint of a typical American washer/dryer, the strange, large size of this mat makes me wonder if the seller designed it this way in order to prevent returns.