First impressions are favorable, i like the insulated holder that comes with it but for lightweight purposes it will not be going with me. i weighed the bottle on its own and it weighed 178g.
On test out in the sussex countryside where all water needs treating it worked very well. I filtered water from a woodland stream and filled a 3 liter platypus in about 15 minutes. one problem was that i forgot to remove the cap from the nozzle when unscrewing the top to fill it up and managed to snap the thin rubber strap that holds the nozzle on. I will have to come up with a homemade strap somehow. Also you need strong hands to squeeze the bottle when filtering water into another bottle.All in all though a very good product that will get a lot of use from me as i no longer need to carry all my water when walking in lowland areas and as it doubles as a water bottle i will always have a filter with me where ever i go.