I guess this derives from the LifeStraw from Vestergaard-Frandsen, the inventors if I am right. It's mainly intended for personal usage by people living in Africa communities.
Pros: very cheap (if I recall, ca. 1-2€), light, easy to carry, very simple to use.
Cons: not as effective, very slow to drink from it.
So, it is muuuuch better than nothing in those areas, but not as good as the other systems you may purchase here. It may be good to carry in your backpack when going hiking in Europe, as a back-up, just in case.
But I would not save on that (money/space) and would go for a proper device if you plan to drink from anywhere in "less developed countries".
Esteban
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