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Been deliberating whether to buy one of these for quite a time. I finally bit the bullet and purchased one. If you are looking for the silencer to remove a lot of noise from your hairdryer than this is not for you. It takes the sound tone of the back of the dryer down to a much more bearable level, however it still omits quite a noise. It fits nicely on my Parlux dryer and stays firmly on. I like the fact that it protects the back of the dryer from hair accidentally getting sucked into it.
This doesn't cut out all noise of course but I think it makes a worthwhile improvement in the loudness and tone of the noise. My Parlux was quiet to begin with for a powerful hairdryer and now it's even quieter! You have to make sure the silencer is really on all the way to notice the difference, and push a little to get a good seal.