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The first unit received died after a few weeks, refusing to charge no matter what. I returned it and the second unit received is holding up well, although it does get warm during playback, sometimes uncomfortable so.
In terms of musicality, I have 'upgraded' from a FIOO X3 II unit, simply because the FIOO user interface was too annoying, what I hated most is the FIOO had no automatic switch off if for example, you fall asleep whilst listening to music, (waking up to a run-down battery).
The AK70's is perhaps more musical than the FIOO X3 II, but I miss the expansive, and open sound-stage and imaging of the FIOO X3 II.
This unit really does sound good, even standard MP3's sound better than the average music player, it is designed to play FLAC / WAV files and older albums transferred to these formats almost sound like vinyl which idemonstrates the fantastic quality of the audio. Sadly it is not Apple Mac friendly, it does not work with iTunes. If you want to put albums with artwork and arrange more detailed organisation such as compilations or Best Of... etc it is way too much trouble and messing around. I quit trying after installing several apps and facing coding nightmares.
Thankfully some artwork is transferred - you must use an Android app for Mac in order to add music. - but it is hit and miss and tagging the music files for organisation and ability to search quickly on this unit is a nightmare unlike iTunes compatible players.
The biggest and most frustrating problem for me is that the Custom EQ simply doesn't work! The automaticlly set EQ Pro is quite good but the personalised EQ does nothing... you can move the frequency sliders in the graphic display but nothing discernible happens, for some reason you can subtract frequencies and make the sound duller or less bass heavy but for more pleasant tonal adjustment it is useless.
I decided to keep this player, but it very nearly was returned. It is a very expensive unit, to find that it is not geared for Mac users or that the EQ doesn't work are major minus points for a player that should surpass expectations. I assume the operating system and installed software is the same on this AK70 on the more upmarket models which can cost up to £3,000, in which case the fact that the EQ cannot be customised tompersinal taste is beyond ludicrous.
Bluetooth and wifi is acceptable but not brilliant, Astell & Kern do not answer emails, customer support is virtually non existent.
If you must spend a lot of money for a fancy unit and impress your friends with a weird looking music player that ok, does sound good, fine, go for it... but, if you want customisable tone and own a Mac I would suggest you think again...