My wife and I use the filter for all of our drinking water, including ten ounces of coffee water each day.  As the filter nears six months of use, the flow rate seems to decrease.  We are on city water, which is slightly softened with a conventional brine unit.  
The filter is easy to change, but could be broken if the person changing it was strong and not aware of the unintuitive procedure: "pull, don't twist".