I would like to hear from those who have used the lightweight Katadyn BeFree filter, especially over an extended period. Someone I met on the FT highly recommended it and urged me to get one for the CDT this summer - but he had used it on only a few short trips. Online reviews show that people who have just started using it seem to love it, but those who have used it over time often report poor durability - seals failing, holes developing etc.