I've been using Aquasana for 6 years now and I am a great fan! I've done a lot of research before I chose it and the primary reason I chose it it's because it doesn't strip the water of important minerals which can be detrimental to health.
The filters work fine. The water tastes good, is odorless and clear. Not sure what the battery/ battery indicator light is for. Seems gimmicky. Just replace the filters every six months or sign up for the subscription service if that's too hard.
Pros: Clean taste, Easy to install, Long lasting filter