I'm mostly concerned with results; is it better, does it work? When I pull the old filter I let it dry out for a few days then do a little weight comparison. Maybe one day I'll cut one in half to see the dirt. But just from weight and the clarity of the water and its taste I'm more than happy how much better my water is. I live in the country, have a well water system, a hundred feet down. County water test results usually show a high iron content which this three stage system cleans and purifies beyond my expectations.
This 3 stage filter system is an upgrade from the previous 2 stage system. It is much easier to change filters than the old model. You do not need a tool and it virtually eliminates leakage after just hand tiring the filters. One issue is that the filters do not last long. To provide drinking water for 3 people, I expect a set of filters to last for 6 months. Instead I have to change filters every 3 months when the water flow getting too slow. I also think that the battery has no use - the filters must be changed long before it sounds. It is better to save those batteries.
Pros: Clean taste, Durable, Easy to clean, Easy to install