Product review (4 stars): Good to have.
I'm glad I bought it "just in case".  I'm sure this is fine... I haven't had to use it after I discovered the real problem with my ice maker was not my refrigerator ... wasn't the refrigerator filter...or the valve.
One minor problem was the half frozen ice cubes in the tray getting stuck and /or water freezing in areas that prevented the tray from working properly.
The root cause/major problem was a dog-gone stupid self tapping saddle valve...don't be cheap like me ...install a regular copper tee with a shutoff.
Saddle valves work fine...for a while...then they tend to get corroded.
It'll happen to you!