I have to admit, after reading some of the posts I was a little worried about installing the unit. It was a lot easier to install than some people suggested. It took me about an hour only because I had to run to the local hardware store to pick up a long socket wrench. As for quality: I've had the units for about a month and the quality of the parts are impressive and the water coming out of the unit tastes really good.
We have had our Aquasana system for only a sort while so can't attest to longevity of system or filters but what I find remarkable is how smooth the water tastes and I tend to drink much more! I use it for coffee so that tastes better as well.
water tastes great, easy to replace filters big plus, water faucet looks good but nut to secure is small in size. Water filter ratings better than other competitor's.
Pros: Clean taste, Easy to clean, Easy to install, Long lasting filter