Quite a few of my friends in the Texas Bushcrafters community swear by the Grayl Geopress but I personally find them too pricey. The main reasons they give for liking them is they can purify a decent amount of water more quickly than other filter systems. They also prefer them to boiling water because most of the time no one here in Texas wants to drink hot water or spend hours waiting for the water to cool.
-Blast