I have the white one so I can't really say whether the black one is a fingerprint magnet or not. However, I can answer your other questions.
I think the active noise cancellation earbuds are definitely worth it. When it plugs into the phone and the phone activate its noise cancellation it brought a smile to my face. All the cars from the freeway outside my house, all the people around me, everything quieted down to almost a whisper. The minute you turn your music on, you can't hear a thing that is going on around you unless maybe something exploded into your ear lol. As for battery life, I recorded videos, took lots of pictures, constantly turned my phone on to check facebook, watched a bit of shows here and there and I ended up with 50% battery life after 8 hours of use. Do note that I had NFC, bluetooth, and auto-brightness on. I think with moderate use, the battery life is amazing. For heavy power-users, it may last them above average the times of normal phones.