Great (especially in the Base Camp filter)
This filter lasts a long time, and is easy to clean. The replacement comes with a small tube of O-ring lubricant to help ensure that it does not leak. There is a fine mesh "filter protector" which filters out larger debris before it gets to the actual filter. I use this in the Katadyn Base Camp (gravity bag) system, and it works wonderfully. This is indeed the correct replacement filter for that system.