I have been on a DAP quest over the last few weeks and briefly owned and trialled the Sony NW-A35, ZX2, Plenue D and Fiio X5iii.
I ended up keeping the A35
- The Sony ZX2 sounded best of all, but was just so heavy and expensive that the small uplift in SQ wasn't enough to justify keeping it. I do miss that amazingly well controlled bass though...
- The Fiio X5iii is a nice player, but not really up to the hype. It sounded a bit too dull by default and the Viper effects are too unnatural (and having to be online to use them is an awful compromise - Fiio need to negotiate rights properly and avoid this inconvenience to their users). The build and design is nice, but nowhere near the Sony standards.
- The Plenue D is a fantastic little player with great SQ (BBE is awesome) and amazing battery life. I was just as happy with the sound from this as I was the A35, but ultimately, the screen and UI on the A35 are sooo much better that that swung it for me. If battery life and absolute minimal size were more important to you then the Plenue D is the better option.
- The A35 has (for me) just the right mix of great sound, compact size, superb UI/screen and decent battery life.