Product review (3 stars): Good idea but overly expensive.
Why this is so expensive is crazy (50) when the parts are probably $10 to $ 20.
If you switch to pex piping you will not have water hammer.  The hammer you hear is from metal pipes that were not fastened well in the walls and a valve rapidly turning on or off.  Water pressure is also to blame.  The first thing you may want to do is check your pressure entering the home.  It should be between 40 to 60 pounds.  If you do not have a pressure regulator get one installed at the entry to your home.  This will protect your pipes and plumbing from excessive pressure.  This can also reduce water hammer.  Then consider what valves you are opening and closing rapidly  to cause water hammer.  Clothes washer in my case was one culprit.  The kitchen faucet and dish washer is another to consider.  Ice machine may be another valve that rapidly opens and closes to send out a pressure wave down the pipes.  If you need to perform a pipe replacement, pex is an advantage here.