I received my Switcheasy Nude Clear case yesterday and it is going well so far.
To answer your question: NO, it does not cover the noise cancellation mic on the top. The cutout in the case goes around the mic. It really does fit well to the cutouts on the phone.
Some things to keep in mind:
The Positive:
Switcheasy included some nice extras that you usually don't see come with cases, or at least I don't. Port covers for when not in use, two screen protectors, and a micro fiber wipe.
The port cutouts seem very generous, excluding the headphone port which may not work with some users headphones. But all of mine work so far.
The Negative:
I shouldn't have ordered Clear, just after one day of use its quite easy to see all the hairline scratches to the back of the case from sitting it down on my desk. Sheesh have to be delicate with the case to keep it from being scratched to high heaven.
The case sits slightly lower than the screen, so if the phone falls face down then you're still probably SOL.
Some of the edges of the hard plastic are rough, should have been sanded down or smoothed or whatever. Over time it will probably correct itself...
There is a slight gap, meaning very tiny, between the case and the metal bezel and I can already see fine dust particles collecting in between this space. May have to take the phone out from time to time to clean it.
It took my case 4 days to ship from the West Coast to the East Coast. No shipping options available.
The purchase is made by PayPal on behalf of Switcheasy... when I made the purchase Bank of America registered it as an international purchase and charged me an extra $0.69. I think they are an international company.