After installing the system, we're adding some notes that may be helpful to potential buyers. Overall, this looks like the right product for us. Good water, fits our under-sink area, provides good amounts of water on demand. Below are some general comments (in letters) and then some comments (in numbers) on what might not be obvious from the online descriptions. First some installation and general first impressions:
A) The water looks and tastes great. Water has a little air in it when first poured, but it goes away quickly and is very clear. B) Installation was as good or better than other RO that we've installed. Lots of optional 1/4" elbows and tubing. C) The ways that the tubing connect into the system as well as the other included connectors/adapters worked perfectly. D) The system has some slight hum from the motor when pouring water, but nothing at any other time. E) The installation manual is just ok, but you only need it once!
Some comments on what is not obvious online: 1) The system seems smaller in the pictures than it really is. They are clear on the size and do not hide anything, but It is pretty big and a challenge to get under a crowded sink. 2) Needs electricity under the sink. Many other RO systems are passive and do not need to be plugged in. 3) The manual says that the water faucet (RO water) has to be turned on all the way - you can't turn it on to add just a small trickle of water to, say, a cup of flour for baking. In our experience, it seems to work fine if you need just a little for a couple of seconds (but the manual says not to do this). 4) In addition to being bigger than expected, there is a another separate alkaline remineralization filter which adds another piece to the things under the sink - and it's big, too. OVERALL: A person should be clear that the remineralization, low waste-water, and active Total Dissolved Solids metering is worth the much higher price. So far, it was the right choice for us!