If I were putting a wish list together for a DAP, it would be the following: Double SD Slots - these are getting harder and harder to find... Neutral/Reference signature with far reaching soundstage in all directions - something to challenge the Opus #2 Smooth and stable UI (!!!!!!!!!!!) 4Gb RAM (to enable the above) SE and Balanced out 10hr battery life LDAC support on BT Decent playlist creation on-board Physical play and skip buttons - I like the X5iii's version of these where a press of skip will go to the next track, but holding it will push the playhead through the track. Or, I DID like this until the latest firmware broke the buttons altogether.... I don't need much more than this, and really it comes down to an overall improvement on the X5iii which I use daily and which (till the latest FW update) I really like. Just itching for that next step up in SQ and wish the UI were a little smoother. Don't need many bells and whistles, because I run it through an XD-05 anyway. SO MUCH comes down to the sound quality/signature and for me now, that's largely centered on an expansive stage. I do have my eye on that Opus #2 but can't justify the expense. If Fiio can rival that at around 3000RMB ($450) I'll be putting money down.