You Titled this thread as the HM-801 being an "MP3 Player".
It should be noted that it also plays FLAC
and Monkey's Audio .ape files. Along with 24/96KHz. Very few players in stock form can do that.
Let alone the superior hardware.
For those that are hesitant because of it's size, think of it this way. It's not meant to replace an iPod nano.
I'm really looking forward to receiving mine. It will be replacing my current portable audio solution which consists of an UMPC and a HeadAmp Pico. Not a very convenient listening set up when walking around.
I am just not willing to compromise sound quality significantly. And with the HiFiMan HM-801, I don't have to.

-Ed