pietcux
Headphoneus Supremus
Regarding battery life. I've been burning in my MH40s with the zx1 for 21 hours now, and there is still 16% left. That's at full volume playing flac, and there is also a burn-in app running intermittently.
My advice is, get the latest firmware 1.14 it's around in the net and is a pain to install. Remove everything you can. It's useless as an android device anyway. Get used to it being only a music player. What you can't get rid of - Google stuff mainly, disable if possible and remove all updates via settings/apps. That will reset them to their original versions and you'll get a stack of space back. Delete caches. The only one you'll need to leave up to date is google play services if you use a streaming service.
The only other things I have installed is Battery Doctor which stop unwanted background activity, and Hola launcher, just because sony's icons suck and it makes it at least feel a bit modern.
Now if only I could remove the eu volume limit....
I disabled the sound device first. Then I tried the eq or the bass boost, which are still selectable and voila, I got rid of the volume cap. My feeling is, it does not only get much louder, it also sounds better by a good margin.