I bought this as the clip on my Line 6 G30 transmitter broke (don't they all?) It hooks onto my belt nicely (Top tip, if you move it around to your hip you can pretend to be a cowboy).
Quality. I like the leatherette finish and the press stud, it's stood up to the rigors of sweaty banjo playing and so far has never dropped the transmitter despite the odd bit of over exuberance in the live arena (or Three Bulls heads as it is otherwise known).
Sound. Not great, it makes a sort of clothy slapping noise if you throw it off the wall or floor but this isn't a problem, I bought the holder to protect the transmitter, it does this fine.
Summary. Good for holding transmitter or mid gig snacks/ pretending to be a Cowboy. Bad as a percussion instrument.