Easy to use, breaks down enough to be cleaned completely. Don't have to worry about mold and such. Fills quickly and fit some water bottles (SIGG and Nalgene) Also works well for filling bladders via the drinking tube. Water tastes great after filtering. Just like out of my dual stage filter on the tap at home.
STURDY, ergonomic; when fixed to a nalgene you can count on no spills and comfortable grip. Reasonably light
seeps a little where the rod comes out of the housing but it is negligible. Hard water WILL lock this thing up, back flush with white vinegar (canning type if you can get it #pun) then enjoy flavored water.
none unless you want to go to a ceramic or a lighter weight model.