Initial impression - Grayl Ultralight Purifier Bottle

I bought this for an upcoming trip to Asia (Nepal, Bhutan and Thailand). I have tested it out on my tap water and local stream but nothing really dirty yet. My first impression is thatthe materials and design is quality. I have no problems initiating the force needed to purify/filter the water. The only drawback as others have noted is the limited volume of drinking water it produces. It would be nice to see this made with about 8 more ounces capacity.