I purchase House system for city water in July 2012, have changed out filters once in Dec 2013.
I love how this system has improved Baltimore's drinking water, no smell or taste. My Brother-in-law from Washington State commented, he has never had water that didn't have an odor or strange taste to it.
Plumber came in and installed in basement so that it captures the water coming in from the main, so all of my house is now filtered appropriately.
When changing out the filters, this took me approx 1 hour, I was by myself and having to release air and build up within the filters and with all the water in the filters, made this very heavy for me to control, so needless to say, I had water everywhere attempting to replace the old with the new....but easy cleanup.
So, after almost having this system for two years, big improvement overall in water, showers and clothes.
My systems at 40PSI and I still have great water pressure. When my pressure goes down and hardly have any water coming through, tells me that it is time to change out filters...once the filters have been replaced, pressure is back up at 100%
Baltimore, Maryland