A game-changer for dealing with tires. I could easily reach my valve cap without having to finagle it with pliers, I highly recommend it!
You simply press the rubber cup on the end of the stick onto the valve cap (and you can feel when it covers the cap completely) and twist the cap off.
Since the stick is lightweight (Feature #1), you can really feel the threads engage when you twist the cap back on. Also (Feature #2), with the lower profile metal valve caps, you can push the rubber cup/sleeve way onto the cap so the cap is recessed in the cup - this means that when you put the cap back on, you have a "run-up" when you push the cup back onto the valve stem which aligns the valve cap and prevents cross-threading. Brilliant!
If you have trouble getting your valve caps off your dual wheels or the holes are too small to get your hand in there, then this is the tool for you. I use it a lot.
I needed that tool to reach the inner valve stem on my work vehicle so I can check the air pressure.