Conclusion: Audiophiles with the means should take a close look at the Iriver Astell & Kern AK100, a high-end media player that delivers exceptional sound quality with the right music files, but it comes with plenty of compromises.
Pros: Incredible audio quality with the right material.
Cons: Extremely expensive. No AAC or Apple Lossless support. Buggy. Mastering-quality files are expensive, take up a lot of storage space, and aren't widely available. No headphones or AC adapter included.