I think the system is great. I am just waiting on a home test kit to compare the before and after quality of the water. (taste isn't giving me an answer to that). I am giving 4 only because of taste, I can't give an honest answer regarding water quality until I get the test kit.

Install was easy
(but it would be easier with two people, if you are doing it yourself, have a leather chamois and a long clamp that you can make sure is against a wall or something to stop the top from spinning as you tighten down. I still have to get under the sink and tighten again.. normal issue with a solo install. Not a pro/con. just a trick the solo installer should know)
System is solidly built

MERCHANT COMMENT:
Thank you for your honest review and for the installation suggestions. I want to make it clear for our visitors that you were referring to the installation of the faucet into your sink when you spoke about the install. Yes, it is easier with 2 people so someone can hold the faucet at the top, while another person is tightening the nut underneath the sink. Please feel free to contact us if you wish to update your rating of the water quality after you do your tests. Thank you.