And, just a guess, but I'll bet in practice you'll find it's no easier if not more difficult getting that long hose threaded on to and then off of a difficult to access valve stem than it is to use an air chuck or gauge with a good angle to it. It certainly won't save any time.
I have one and I only used it once at home. But, that's not the reason I bought it. If you ever try finding air when you are on the road, you'll be very glad to have this when you find out that you can't get access to your valve stems otherwise. Of course, I keep a compressor in my saddlebag so I don't have to worry, but one of these days it won't work when I need it most. For the price, these were a great Christmas gift I got for my local riding buds last year.