Here's a quick out-of-the-box test with the mic at full gain.
I like to do "distance testing" to gauge sensitivity (subjectively). It let's me know how things will sound when the mic cannot be place optimally.
I bought my Apogee MiC from Amazon UK.
Unlike the lovely Blue microphones, the Apogee MiC will work with iPhone 5s and so far I think it sounds great, and has a lot of potential with the serious iPhoneographer. (is there such a thing as a serious iPhoneographer?!)