I've just upgraded from an X3 (which I love) to an X5 and am absolutely astounded. Wonderful clarity, excellent soundstage, perfect balance of sound without me needing to touch the EQ and is just flawless in its sound reproduction with every type of music I have thrown at it.
I'm currently listening with my B&W P5's plugged into it and it is glorious, but it is equally at home with Cosmic Ears HY3 and UE900's.
So glad I invested in this DAP. Congratulations to all at Fiio for this player, you have done a wonderful job and I don't imagine me doing any better than this without spending three times the price.
For those that play lossless and/or hi-rez music that are still sitting on the fence about this DAP, then just buy one. Your ears will thank you for it