I absolutely love the M11. It's the best sounding DAP ever because it has no soundstage. Just zero. Never heard anything with less soundstage before. Now that i have it i notice that the big soundstages always were obstructive in daily tasks. With the M11 i can do anything while hearing music and focus on other things like cooking, working or sports. I also only listen to music i would listen to with 10€ buds too now because i like it and not that gay audiophile crap like norah jones or diana krall just because it has good quality. I really hope Fiio will release something which sounds exactly equal when the M11 is outdated hardware- and softwarewise.
Handling, speed, and battery is also impressive and everythings works nice.
So if you want a DAP for daily use while doing other things like walking around in city, working, gym etc and you find a big soundstage distracting i highly recommend this DAP.
If you wanna celebrate an audiophile fiesta at home counting how far away the orchestral people are from each other this DAP might not suit you.
Edit: Didn't like the Pro version though. Bigger soundstage but overall worse sound than an average standalone dac/amp combination and less bang for your bucks.
Edit 2: closed cans sound claustrophobic as **** with this. So can only recommend it for IEMs.