Think of it as a water-bottle vending machine built into your house, with a second faucet (color-matched to your existing one) just for the water you actually drink and cook with. Your regular faucet still handles the dishes; this one is for drinking, cooking, and washing produce.
Reverse osmosis works through several stages in sequence: a pre-carbon filter, the membrane itself, then a remineralizing post-carbon stage. It is the setup people choose when they care how the drinking water at the kitchen tap tastes.
The tankless unit is about the size of a games console and takes up very little under-sink space. Most people add it while the whole-home system is already going in, because the visit is the same either way.
The dedicated drinking-water faucet comes in four finishes, so it fits right in with the rest of your kitchen hardware. No upcharge games, just tell us which one you want.
Lifetime warranty on the control valve and tanks. Those are the parts that decide how long the system runs well, and they are covered for as long as you own it. The media and the electronics are covered for five years and the reverse osmosis unit for one, with a flat trip charge after the first year.
Chrome

Brushed Nickel

Matte Black

Brushed Gold