I have one. No it's not quiet. It's also probably one of the worst skimmers out there--2nd to the skilter. I only have mine because I got it for free & I'm using it on my 15g Mantis tank, till I can find a good deal on a better one. Better than nothing, I guess. Really hard to dial in. Either it's skimming nothing at all or overflowing onto the floor.
What size tank do you have?