Final thoughts
At the end of the day, just buy what you like to hear. Sometimes a cheaper headphone sounds better to you for some media/music/genres/wtvr. Sometimes or most of the time for you it's only the expensive setup. For me, I'm delighted that for my ear I prefer the APM in a few genres and that they give me a lot of fun and practical use cases the 800 S couldn't. The 800 S does not have portability or rich deep frequency presence like the APM do. I've already enjoyed getting up from my desk to walk around my place in ways I couldn't ever do while wired. I can listen in privacy while other people do their own thing around, and I can do this when I leave home as well. The thought of having an enjoyable, even preferred audio experience for some genres/media while traveling...is fantastic.
I will be getting a Drop Panda and AKG K361 in the mail in the coming week or two and will compare those to the APM next. I will keep only one of the three after that comparison. If I can't return the APM, and I end up preferring the sound qualities of the Panda or AKG, then I'll let my wife take the APM off my hands. I actually caught her trying them last night for several hours. First she watched a movie and then leaned back in the chair with her eyes closed, listening to her favorite music for an hour - I even needed to remind her of the time. She normally goes to bed early. This alone was something to me that a non-audiophile would be able to pick up these headphones, genuinely enjoy them without any presumption of critical knowledge, and stay up past their bedtime to keep going.
If you guys try to listen to any of the tracks I've tested, and have similar gear (800 S and APM), and feel differently, please feel free to reply with your own experience!