I've been wanting to chime in on the matter of the QP2R and, per one Head-Fier's post, pairing it with the Campfire Audio Cascades. I own both. First on the DAP... the QP2R is a wonderful sounding DAP but admittedly its functionality is poor. One has to consider that, even though it has balanced output unlike its predecessor, it's at the sacrifice of a line out function, not a minor point I think. Also consider that it lacks wi-fi, not a minor point when it comes to firmware upgrades. But I think what peeves me the most is that its scroll is still lousy; Questyle claimed that they fixed it but it's still just there for show as far as I'm concerned.
Now about the Cascades, ah, the magical Cascades. Forget the urban myths you've heard about their bassiness and such–I think they're amazing. As they relate to the QP2R, they're an okay match not a great one. The Cascades scale up beautifully and sound stellar, for example, with an AK70/iFi Nano iDSD Black label rig, which together costs less than the QP2R and gives you wifi and bluetooth as well.