Product review (5 stars): Works as advertised, just what I was looking for!
I had severe water hammer problems with the line going to my dishwasher, I installed this water hammer arrester inline (installation took about 4 minutes) and the water hammer is gone!  I would definitely recommend this if you are having water hammer issues with your dishwasher piping.  It may not work for extremely severe cases but it worked great for me, feels good knowing that this was made in the U.S.A. as well!