Definitely very interesting for emergency preparedness kits. I live in a land of earthquakes and periodic week-long power outages after ice storms, so I'm always looking for things that make dealing with that kind of event a little easier.
But I agree with others, I can't see it as a daily use device. A much more compact 3000 mAh battery for daily carrying costs around $20 on Amazon, a 15000 mAh that will give me several days' charging for travel or power outages cost me under $50 and is about the size of this one. A 5000 mAh I bought 5 years ago is still going strong--which is an advantage to using established technology that's been around a while, versus a brand new fuel cell tech that they're saying *may* have a lifespan of more than two years, but they don't know for sure.
It's something I'd pick up for emergencies...a few years down the road, once the tech has been proven and the cost comes down a bit. Meanwhile, I'll stick with regular battery packs that can be recharged with my solar panel or generator.