it is a very good product, we used in the past the above counter unit but is is better, we changed from the culligan reverse ormosis which is so expensive to maintain
Happy with the performance, it's a tad quicker than the counter-top. MY install was trickier than most: had to drill a new hole in cast-iron sink for the spigot. Also I've got a ton of neck & back problems, so squeezing under the sink was torture & sent me to the Chiropractor! However everything went smooth, I used plumbers pipe-tape on every fitting I could reach not a single drop of leakage!! Just follow the directions!
Installed on my kitchen sink to replace RO system that was leaking. This seemed much easier to install. But this system leaked too. I felt the filters and one of them was wet on the bottom, although fully inserted and tightened. I removed the filter and reset it. Hopefully it won't leak anymore. I seemed like the o-ring didn't completely seal.
The nut that holds the spout to the unit is woefully small an extremely hard to tighten. Since the thread on this is not available in hardware stores, it would be a huge improvement to have a large wing nut come with unit, in addition to or instead of the small nut.