I have a Katadyn Hiker Pro that has had less than 8 quarts pumped through it....and less than 4 quarts through a new filter cartridge (I tried using it in silty desert water in the first 3 quarts and tossed that cartridge). The cartridge in it now was used in crystal clear spring water. I have all the original pieces that came with this filter.
I'm keen to trade this for a used Vargo BOT (titanium). I could throw in some cash too depending on the condition of the BOT.