I have them and have previously used the Alpine, ER20, and Earpeace offerings, personally I find they all work but the flare do cut the noise levels much more, if they didn't work I wouldn't use them simple as that and I'd certainly have no hesitation in saying they didn't do the job, the only thing i cant compare them to is the custom moulded type of plug, which in my view ought to be a superior option anyway given the price difference.