Kervsky
100+ Head-Fier
Just an FYI for anyone running firmware version 0.2.1Beta. There's a bug in the software that causes the volume to get stuck going in one direction. It depends on if you're increasing/decreasing the volume, and usually occurs while listening to music with the display off. Sometimes while switching tracks with the volume keys will trigger the bug, or just double tapping the volume keys to adjust the volume. The device will get stuck going to 0 or 100, depending on what the user is trying to do.
BEWARE, IF YOU USE IEMS!
I think it jams when one confuses the buttons too much. I only accidentally induced it once. But it is worth noting.