We had our WD- N1 Countertop now just over a year, and just replace the CF and had not yet replace the other one yet but should be close. The filters are very easy to replace and only take a few min. We've had no problems with water come out between 09 and 12 with good taste. We have saved a lot over the past year on water and would recommend the N1 to anyone. Also the company had be great on shipping.
This is my first filter replacement. Easy to install. As for expected quality and duration life of new filter, will need to wait and see. Initial water quality is very good.
Pristine water, durable parts. I wish there is a way to directly outflow to nearby sink and inflow fresh tap water without lifting out the container with the N1. N1 I use in my RV and rented accommodations