I will put in a vote for the Questyle Audio QP1R. The QP1R sounds the most resolute with the Empire Ears lineup out of all of the DAPs, some quasi-DAC/Amps and some DAC/Amps that I have compared, to my ears including and not limited to; the Intermedia Lotoo PAW Gold, Altmann Tera-Player, Chord Mojo, latest Onkyo and Pioneer DAPs, all AKs (I haven't listened to the AK300 yet, though), HIFIMAN players and others, as compared in my QP1R review, here:
http://www.head-fi.org/t/778877/review-questyle-audio-qp1r-with-multiple-headphone-and-iem-pairings.
With regards to the Mojo or any other add-on device, I would just rather not strap a device or add a device to my source that will automatically add bulk, an extra cable attaching to the source, and adding another device I need to charge or keep charged, especially when I feel the source sounds better to my ears (in my specific case, the QP1R).
It's all good because I'm glad that there are products that take care of individuals' wants and needs, as there are a lot of people that don't mind the bulk/requiring extra cable/extra device to charge or keep charged and love the sound that the Mojo is able to create in a mandatory conjunction with a source.
Funny thing, the m9XX that I own sounds very similar to the Mojo, so even if I went with the Mojo for strictly home use, I've got a very close in sound signature already that is the m9XX (not to mention it costs less as well).