Product review (5 stars): COMPLETELY solved my noise problem!
We recently installed a stacked Whirlpool top-loading washer and front-loading dryer in our apartment (model LTG5243D) in a former bathroom that has small tiles on its uneven floor.  The spin cycle of the washer was so loud that it bothered my downstairs neighbor and the whole unit was also "walking" forward.  Once we installed Silent Feet, the spin cycle is so quiet that I don't even notice when it starts - I can't believe what a difference it made! - and the unit is no longer moving forward.  I will say that the feet were a bit hard to install - the back feet came off a couple of times when we slid the unit back and we would have to start over.  But now that they're installed, they work incredibly well.  HIGHLY recommend this product, worth the cost.