Product review (4 stars): Works well
I bought these feet to prevent my washer from walking around and also to reduce the noise.  It does both of these things well.  I noticed that the washer does move more (sways side to side) than it did without the feet.  It's not an issue for me because I have enough clearance around the washer for it not to hit anything.  But I think if you have less than an inch of clearance between the washer and a wall, or the dryer, it might sway enough to hit them.  It did make a noticeable reduction on the noise.  They are kinda overpriced which is why I am giving them 4 stars.