I have been using this for over a year now and use it nearly daily. Extremely versatile component can be used not only for mobile play, but also line out to my receiver (don't yet have funds for dedicated media center), and as a DAC for my desktop and laptop. This allows me to have almost any combination of source and output that I need from one portable device. The mobile setup is easy and music transfer directly to the micro-SD is a lot faster than through the device. Going through my ATH-M50x, the music is incredibly clear for DSD or FLAC tracks and there even is a noticeable jump in quality playing the same MP3 on the same headphones between my phone and the Fiio. The dedicated line level out allows me to plug it directly into my receiver to get FLAC play on my home setup without an expensive dedicated server or decoder or upgrading my current equipment. The DAC feature took a long time to troubleshoot as the exact order software is installed is extremely important. A recent revision to the installation guide has cleared up this confusion almost completely (might have been just me.) The user interface is fairly intuitive, but creating playlists on the device is extremely cumbersome. I have not tried exporting playlists as of yet, but I should try that. Battery life is extremely impressive, even at decent volumes. Overall, a great buy I would not change. The X1 was missing a few features I was looking for and the X5 was more than I needed.

I purchased these headphones based on reviews, specifications, and looks and I am not disappointed in the least. The initial comfort for the headphones was good, but it took some adjusting to stop the headband from applying too much pressure on the top of my head (might be my head alone that has this problem). Listening to Santana Abraxus DSD 2.8MHz on my Fiio X3 II, My first impression of sound was the amazing clarity and definition on high notes. Crisp and clear without sounding too high. I would like to know if those complaining about emphasized highs are using equalizers as I tend not too. The lows are extremely well handled as well without overpowering the track. I enjoy listening to a mix of classical, rock, alternative, and jazz and these seem to be very well balanced enough to handle all sorts of genres. I do not have much hi-res music in the heavy metal realm, so I do not have a feeling for that. For the price, these are a fantastic deal for entry level headphones and the build quality and sound at this level makes me want to try there higher end phones if I can ever save up for them.