I've had a few instances where the sound cuts out for a split-second, but only when they are in my front pocket and I am walking. I think this may be a bit of an issue with my phone which I am currently hoping last until the 8 comes out. I have a 6 which has been dropped too many times, and quite frankly, I'm surprised it still works.
I bought them for the gym but now use them as my everyday headphones. They are great at work as I can just take one pod out of my ear if someone comes to talk to me or the phone rings and my music pauses, then starts again when I put the pod back in my ear.
Using Siri for music functions has worked fine. I don;t change my volume much, so I haven't had to do that with Siri. I generally use only two volume levels: low ambient noise (approx 30%) and high ambient noise (approx 75%). That could be a new feature: ambient noise detection and auto volume adjust.
They are so comfy I find myself checking occasionally to check they are both still there.
The AirPod case is small enough to carry around, but as I read on the train I pop the pods in the case then, and when I shower after my workout, so I haven't run out of juice yet.
I think, if I would like a new feature (apart from the ambient noise thing I mentioned above), it would be programmable (or pre-programmed) tap sequence functions: 1 for Siri, 2 for next, and 3 for previous maybe.