Hi Lee
Yes, they do seem very good, with a very broad range of filtration, heavy metals, viruses and taste improvement in one filter is impressive.
It does come at a cost though, 11p per liter for the handheld bottle.
For longer term applications it would still pay to investigate if you need all those capabilities. You do on your journey, so it might be your only choice. For a lot of uses like aid workers or missionaries who spend a long time at one location a more limited but much higher capacity filter (i.e. thousands of liters instead of hundreds) might be more suited.
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