Better than I expected. I've got the On Counter type, and not only drink lots of water but also make tea during the day. The flavor of both drinking water and tea is clean-tasting. Not just chlorine removal as in my old filtered pitcher, but a fullness which I cannot describe in writing, but can clearly be tasted.
We used to use a water cooler because our water tasted awful. Then I learned my water cooler didn't remove all the impurities that Aquassna does. I'm seriously considering upgrading to a whole house unit.