gerelmx1986
Headphoneus Supremus
I'm in the process of deciding between the F887 and A17, sound quality is #1, but I really hate Android bloatware and battery life also important of course - sounds like the A17 is the best compromise and it's cheaper to boot (no need for 20 day Japan import). I'm running SE846 with a Fiio E12 - I would never run any Sony DAP without an amp, they lack power. Any review should include a good amp as well.
I haven't never heard an F series tough the guy who sold me the Fiio x3 had an F806 but didn't bother to ask for it, now i regret LOL, however i Had an X1060 which has the classic sony UI of the A17, and to me the x1060 was superb sounding on it's time, pretty musical.
Now i can say A17 is an upgrade form the X, despite it gets rid of the warm sound but is not that completely neutral it has yet still nice warm sound but more neutralish, more details, huge soyundstage.
Now if we compare a fiio x3 which are known for their DACs made by Wolfson microeectronics, still the A17 blows the fiio out of the water (fiio is more warm class A-like sound) more details, big soundstage better separation of instruments, has no more floatinh instrumenst and/or voices that have plagued the fiio (IMHO i hate hearing a Madrigal by palestrina, monteverdi etc and hear floating female voices).