I'm quite curious about how the 20hr playback time is calculated against. I got ~15 hours running through 320 kbps MP3 files.
I quite like the sound especially when paired with my Spartan IVs, but I'm shelving this until some more firmware updates coming down the line in favour of the Sony A45 for a couple reasons:
1. The battery life doesn't seem to be indicative of playing MP3 > 128 kbps, I get 15 as stated above as opposed to the 37-40~ on the A45
2. When the Music App crashes, it requires a full reboot to work again and it's simply not clear that the app crashed as opposed to you having swiped back to the main menu
3. The volume limit option does not work, I've had to disable the wheel to avoid blowing my ear drums out accidently when the screen is off.
4. It locks up when booting up or even a reboot quite often, I have to do a forced reboot about once every 2 days.
5. This is more my own fault, but a Hold switch would have been nice since the it's really easy to register a click on the buttons with something as simple as trying to take the player out of a pocket.
I'll put up with the sound being a bit different with the A45, having to retag my entire collection to ID3 2.3 and having to redo the embedded album art for half my collection because of odd design choices by Sony for ID3 2.4 and Progressive compression jpgs,
But hopefully some firmware updates fix up this by the time I get my Phantoms because they really shine with the M7.