I own the AK100 and the Fiio X3 and my first impressions is the sound quality is identical so i am now thinking of selling the AK100
on ebay . I have only had the X3 for 4 days but it is fantastic. it maybe early days but X3 is very impressive .
Prior to this I owned a Nationite Sflo 2 with twin 8740 Wolfsun DACS and that in my mind is better than either player.
By the way I cannot get the Fiio X3 to display artwork - any ideas ??