CAPS LOCK MUSIC
Neil Young was one of the pioneers in turning up the volume until it massively distorted into a new sound. I'm guessing this device adds some magic distortion that sounds good to old buzzy ears. Zero feedback amplifiers are terrible performers, especially if you're trying to keep the power consumption and parts count low for portable use. I'm sure it's great compared to MP3's destroyed stereo phasing, but that's setting the bar extremely low.
If you want to target people who really care about sound, skip the "audiophile" gimmicks. Just build a high quality player with enough storage for lossless encoding. If you really want a fanbase, let people upload custom DSP code that can mess with the raw bitstream. People will be trading DSP algorithms and buying players just to try them out.