I've been using a siphon hose just like that (different manufacturer) for almost 20 years now. I won it in a raffle at Operation Shore Patrol in WA. They work great and no more fuel in the mouth! Filling small fuel tanks can be a challenge if you're not quick on the draw pulling the suction end out of your gas can. Once they get flowing they'll empty a 5 gallon can in short order.For the price, I think that should be one of those necessity things that one carries in their off-road "tool kit".
I didn't even know about this until you guys posted it, but it seems very handy to have. Not just for the Jeep either, I'm sure I could use this around the house for lawnmowers and other power equipment.