Berserker and Jason:

Thanks. I'm definitely interested in it (as in, I put it on my birthday and Christmas lists.) It gets that last half pound out of my pack.

I appreciate hearing your experience, Berserker; it's reassuring. I'm thinking that this will become my weekend filter, since I'll be hiking solo and won't need more than 6 or 8 quarts of water for two days; I also carry a nylon bowl so I can dip water and let the sediment settle before pumping. I can do the backflushing at home, and deal with any airlock issues when they aren't critical to a trip. (My Miniworks will probably remain my filter for trips longer than a weekend, since cleaning is a definite non-problem.)

Jason, thanks for taking it to an authoritative source. I wanted to get some additional reliable information before it became a case of "This filter is flawed; it says so on the Internet."

Glenn