I'm actually a big fan of the filter, because, especially if you get a decent bottle or inline tube filter, of which there are a couple, you really get some on demand hydration. And I personally think the weight gains of having to carry a little more water for treatment time, and the noticeable taste keeps me on filters. Yeah they also don't protect viruses, but there aren't too many waterbourne ones in the US so I hear, and if you go abroad, just add some AM and get the best of both worlds. Any of the katadyn or Bota of boulder filters fit nalgene sized openings, which increases your water bottle weight, but still adds up to less. Seychelle and some others may make some, but I'm lazy and don't wanna check.