I had 4 Maxxis on my old MX5 and they are a good value for money tyre, you cant compare them to leading brands, although the ones i had were, I'm told, a direct copy of the Goodyear Eagle.
Never had a problem with them on a mx5 but I suppose that could be the difference between 140 BHP and 308 BHP.
If anything I would say they were a tad noisy.