Just posted a quick n dirty video walking through the physical and firmware user interface over on YouTube. Check it out if you're interested in how the M5 looks in action. Just keep in mind, I'm no video pro, lol ;-)
Valensilius_ZephyrusYes, M5 is capable of gapless playback. FLAC is best in my experience. MP3 and AAC might have a very (and I do mean very) short blip between tracks. No worse than other comparably priced DAPs I've use and better than most.