Yeah, they talk about using it for runners but how quickly does it fill? Would it require a full marathon length to fill a single water bottle? It may still be practical even if that's the case. I'd like to know more.
My first thought was it would be fantastic for backpacking (in high humidity) if the fill rate is high enough and if it didn't need batteries or heavy solar panels or anything. Water adds a lot of weight when you have to carry it. If I could just sip an ounce at a time and not ever have to carry it on my back, I'd literally be a happy camper.