Reviewed in the United States on November 30, 2014
I am not very handy and I was able to install this in about 3 hours. You'll need to go buy a $10 1/2" granite drill bit from Home Depot and 4 wall anchors with screws. The screws that come with this installation kit were not big enough for my needs. Also, check your outlet under your sink. My outlet where the garbage disposal is plugged in is on a switch. That means both plugs are on that switch. You will need an outlet that provides constant power because the UV filter needs to be plugged in.
If you're looking for the best tasting water, get this RO system. It re-mineralizes the water. I think it tastes similar to Fiji bottled water and Fiji is one of my favorites. I live in southern California and the water out of my fridge (filtered) still tastes metallic to me. This water is absolutely void of any metallic taste.
When I was researching which RO system to buy, I was only interested in the best possible tasting water regardless of price. I'm pretty sure I found it with this system. It is on the costly side of other RO systems but I believe it was worth the $$.
UPDATE 9/20/2015: I have had this system for 10 months now. The faucet that comes with the system started dripping to the point where I had to call the company. They said it was covered under warranty for 5 years and sent me a repair kit. As I stated before, I'm not handy. I find this to be very inconvenient. I tried anyway. I ended up breaking the handle and ripping the skin on my finger trying to get the handle back on. My recommendation is to buy a better faucet from the beginning, not the cheap one that comes with it. I learned that you will need a NO AIR GAP FAUCET. I ordered one here on Amazon for $37.
UPDATE 12/7/2015: I just ordered the replacement filters and replaced them (Annually). On one of the filters, I did not secure the fitting on the end very well. When I re-pressurized the system, water came pouring out. I shut the system back off and pushed it in a little further and now it doesnt leak. This whole process took about 20 minutes. The ends come off pretty easily. Just make sure you put a towel down before taking any of the filters off or water will be all over the floor.