The system itself and the filters are easy to install. I've been very happy with this system so far. I would recommend to anyone not wanting to purchace a whole house system.
The purifier works fine but replacing the filters is difficult. We already replaced the whole unit two and a half years ago (after using it for three and a half years) because it was impossible to replace the filters (The hex nuts are tapered, and using a wrench on them rounds them; once that happens, the only thing that works is the difficult task of disconnecting the hoses to allow use of a socket wrench). Increasing the cost by replacing the entire unit more frequently appears to be the only solution.
I've had difficulty with the O rings leaking. Also the faucet diverter doesn't always cut off. Because I have poor hand strength it's getting harder to loosen and tighten the covers.
This is a great filter system. I trust it my water tastes good, the chlorine is gone. This is for me only, it doesn't get much use. I love everything about, except the price.