Dude, that bellows is a joke. Spent ten days canoeing out west....on two different occasions...and started a fire each night without something like that. Just something else to carry and keep track of.
..... even in the mountains after a downpour I've never used a straw or bellows and have always managed to get a fire going. I still carry petroleum soaked cotton balls which work as well as everyone here says. But now I carry a handful of the cubes I mentioned and I'm confident that they'll work even better and burn hotter and a whole lot longer. JMHO.
There is wet....and then there is
WET. Sometimes starting a fire and keeping it going can be quite challenging, even with the very best possible tinder and fire starters. Anyone who has spent a lot of time in coastal Oregon, Washington, BC, or Alaska will know what I mean. Sometimes even Minnesota, as Byrd_Huntr notes upthread.
This device sounds interesting to me. I think it could be useful for anyone operating in extemely wet areas. I have many times huffed and puffed till I was about to pass out, trying to blow enough air onto just the right spot on a fire to get it going and keep it going.
It is also food for thought for improvising something like this from other gear. For example, my tent comes with a short piece of aluminum tube to repair tent poles. I could probably use that to help direct air into the best spot when fire starting. It would be much shorter and lest handy than this bellows tube, but might still work better than just blowing on the fire.