Product review (3 stars): This may or may not filter metals and other contaminants--read the fine print
ANSI/NSF 42 compliance does not perform to the same level as ANSI/NSF 53.  So while I went through three of these and am now looking to re-order, I discovered that other types can be both 42 and 53 compliant, meaning they also filters heavy metals, whereas these Water Sentinels are not certified to do so.  However, as you will see in one of the replies to this, the manufacturer claims it is built to the 53 standard but is in an extended process of certification.

So while the LG part costs more, you are getting a product that has been certified to perform better.  I will opt for the LG for now, since one can never know what metals, benzene, and other contaminants may be in your local water supply, but you may make your own decision as to whether the manufacturer can be taken at their word.  You can search google for the difference in standards, but here is a link: http://www.wqpmag.com/not-all-filters-are-created-or-tested-equal, where it explains 42 aims for taste and odor ONLY, and 53 aims for health-related claims.

As for how these actually make the water taste, I had no issues at all with that, and they worked properly for six months each, so for that reason along I might recommend them to those on a tight budget.  I would guess that people with softer water can expect more longevity from these than those with hard water.