I've had this for awhile and just recently used it for the first time. It works great and fills up a big nalgene really quickly. wish it was a bit smaller but oh well.

Works flawlessly with my Guide filter.

Get this once your filtering gets slow.

We used a friend's last summer, in a group of 4. It simply kicked butt. This filter cranks out so fast with little handle pressure. I have a Hiker (also had the older PUR Hiker) and I'm getting a Guide Pro because: The Guide pumps 1.5 liters pm while the hiker does 1 lpm (50% FASTER!). The Guide needs way less handle pressure than the Hiker. The Hiker is better than any MSR I've used and the Guide is so much better than the Hiker. Small negative is you gain 3 oz (11 vs 14) with the Guide. I'll carry the 3 oz extra any day when faced with 8 or more Nalgenes and a camp bladder bag to fill up. Best filter yet!

This filter is great, it pumps a ton of water fast, and is simple and small enough to take backpacking or where ever. I have started taking this just in case when I am on long bike rides or hikes so that I don't have to pack as much water and I can still drink as much as I need.

I used the filter this last weekend as a backup water supplier. Unfortunately, our GPS unit failed and we got lost in Southern Utah. This filter saved us. We were in a little slot canyon in Escalante and got a little nervous when our water ran out. The only water we could find was in cesspools that wreaked and were covered in a nasty little film and filled with bugs. Of course, the water didn't taste great, but none of us ended up getting sick. I was very pleased with it. Plus, the Nalgene attachment is kinda cool and convenient. It pumps water pretty efficiently as long as you clean it after every use. Oh, and it's way simple to clean. I couldn't have asked for more.

This filter is easy to use and fix. I broke mine in the backcountry and was able to fix it. It still worked very efficiently and effectively.

This filter works great. Was able to pump out 5 liters of water in a matter of minutes. Hands down, blew the MSR filter we "tried" to use last year away. Water tasted great, and the Nalgene bottle connection output piece is great. Note: Nalgene adapter does not work with the new Eddie Bauwer Nalgene bottle (the top is to big to screw into the adapter).

This worked great, we had two of them for three of us, one would have been plenty it works fast and none of us are dead from anything waterborne.

Great filter, pumps water way faster than the MSR, field maintainable, filter doesn't need constant scrubbing.