This is my third(original was installed with house and I have replaced two).
The product seems to last 7 years.

However, I was not supplied a bushing for the copper tubing - you need this to attach the unit to the cold water supply and have a seal. I realized this after I removed the old unit and started to compare it to the new. 

Also, the requirement for a bushing is not included in the instructions - it just shows the tubing on the unit being attached.

Additionally, if you do this yourself like I did, you will need a tool to cut the copper line if it needs shortening to attach to the cold water line.