A few more impressions.

I've just received my Galaxy S6 the other day and have been using my BTunes with it. Pairing, as with my Xperia Z, was incredibly simple using NFC. I love that it has this feature.

Audio quality is great. I've listened to music, watched part of a movie, and done phone calls. No complaints at all. Only hiccup was when my QC25 batteries died in the middle of a call, but just turned of active noise canceling and it was fine. Also learned that it's easy to switch from speaker back to headset by just pressing the multi-function button.

Voice quality is still TBD. I heard from a couple of people that I sounded a bit digital, but I can't say that it's b/c of the headset, as the VZW reception in my home office is pretty weak (low-moderate 2G signal), so it could just be the phone. I'll try it outside later and see how it is. I have heard that background noise is fairly minimal, though, so that's a plus.

My trip this week got cancelled, but I'll be traveling next week and will report back in on my plane experience.

As for use case, I can see myself using this for calls at home or in the airport, although I think I prefer speakerphone for now. I think the most common use case for me will be on the plane, train, or in the airport. I really hate walking around the street or jogging wearing any kind of headphones/earbuds, so that is a non-starter for me. If you're someone who wears these sort of headphones all the time (at the office, on the street, etc.), then this is extremely convenient to have. Heck, I suppose I could even keep listening to my music when I get up to go to the airplane lav without worrying about the cord getting in the way (if you know what I mean)!

Overall, this is a cool gadget that does what it says, and does it well. It also looks kinda cool, imo. I'm interested to see what kind of comments I get, if any, when I travel with it. At this point, I really have mostly positive things to say about it.