People have been meticulous about listing their impressions for the APM.
Mine just arrived today and the only, literally, only problem I have with them is comfort, or lack thereof.
I can't leave them on my head for more than 40 minutes at a time. I feel my head is clamped and the weight really isn't offset by the mesh "hammock".
I know, that Apple engineers have researched the perfect size and whatnot as they always do, but the force with which APM hold on to my head is excessive to the point of causing a headache.
I'll give them a chance, since I love the sound, the transparency mode clarity and phone call quality on both sides - I have ceased to use my QC IIs for that purpose as they're terrible as a phone headset.