Can all reviews regarding top quality (MP3, FLAC) confirm. Use AKG K 550 headphones as when Köpfhörerverstärker no FiiO but a "Practical Devices XM5" and the listening experience is also a perfect. Firmware is being continuously improved (Beta 2:36 play after the last song in a folder, the first song in the next folder!). Delivery is over completely, it was thought of everything; even a USB card reader is. Can highly recommend the X5 every hi-fi freak. I'd buy it immediately again!
Update 08-03-2015 Have the AKG K 550 is replaced by the Bowers & Wilkins P7 - is the more inexpensive, the X5 sounds even better and can bring to bear its strengths even more!