Product review (4 stars): Just read the instructions and follow the recommendation to turn off the water supply.
Excellent, but 4 stars because it is expensive.  When installing, if you have any kind of decent water pressure In your home, you will need to turn off the water supply and open a faucet until the pressure is off.  Otherwise, the filter is almost impossible to remove.  With no pressure it can be done with two fingers. I found using a faucet easier than pulling the fridge out to get to its water supply.