If you're looking for a premium portable high-res player, then the M2 deserves a listen...
A good way to get into high-resolution music
The X5 is quite a good thing, but there’s too much of it
This Sony Walkman is an object lesson in building a well realised, high-performing music player.
A seriously talented performer that has a few design issues
Sony seriously impresses us with its first attempt at a premium high-res audio player
A great music player with good sound and flexible storage
Sounds solid, and is a worthy Apple alternative
Nicely balanced sound but the touchscreen lets it down
Neat ultra-portable player that packs a punch