Fast and easy
I've used mine for years now and pumped water from clear mountain lakes to muddy coastal creeks (have yet to try with either salt or brackish) without ever getting sick. Plus I like that I can choose between fast flow for realtively clear water or slow to remove particulates from muddy. Never had any issues with weight or size.
There only two drawbacks: 1) I've never been able to get the output hose to work properly. The water flow usually pushes it out of the pump. 2) If it's on the longer life setting you must pump very slowly or untreated water will flow from the cap and potentially into your bottle, but that's easily overcome if you remember to pump slowly.
Those two factors aside: this is light, filters fast, is easy to use, gets rid of nasty critters from the dirtiest of water, and leaves no chemical taste. It gets thumbs up from me.