I bought this to try out about a year and a half ago. Here are my final thoughts and test results.
Out of the box this fuel-less USB chargeable lighter worked perfect. It is water resistant and of course wind proof. The fire is ignited using an electric arc so no matter the weather you are always going to get ignition for your fire.
There is a protective cover which has a clip to prevent it from opening in your pocket or backpack. This makes it quite safe to carry around.
I love the fact that I can charge this on the go with my portable folding solar panels. Or you can charge it up using any standard USB phone charger.
I am amazed that this starts tinder, paper and just about anything flammable with ease in any weather. I have used this on very windy days with no problem. And I have used this on very wet days with the same success.
I was really amazed when I started a fire in my cook stove using just tinder and no paper or lint. The electric arc is powerful and started the tinder on fire right away. I did not expect it to work this well.
I now carry the TekFire fuel free lighter from UST everywhere I go.