 He found the "iPod sounded vague and blurry next to the pristine X5" when playing identical ALAC audio files.The review also noted that the PonoPlayer plays fewer formats than the FiiO X series players, but costs more than the X3.A review of the X3 in "Hi-Fi World" reported that the sound and amplification are good, but added that the interface was "least intuitive" and "inelegant."