Product review (4 stars): Water hammer is an absolute must buy with it.
When LG washer & gas dryer set was installed, I didn't know why there was a huge knocking and banging sound from the washer and the hot & cold water pipes were shaking violently.  Thanks to TJORD, I saw that I was missing two $10 water hammer units that takes the sudden decrease in pressure from the HE washing machine.  Don't expect Home Depot to tell you that you need these water hammer unit before the connection to the water hoses.

I went with the white color since it was $100 cheaper than the gray version.  So far, it is working great as it gets my cloths clean like from commercial laundry mats and the matching gas dryer works great at drying my clothes.  These are at least 8 inches longer in depth than traditional washers and dryers, but it saves much more in water and electricity use.  The top and side covers are made of steel with paint coating which address a complaint I saw on Samsung washers and dryers that use plastic and it discolored from laundry detergent landing on it.  When the washer is in use, a red icon lights up and you can't open the washer door until you pause it or turn it off.