A well done single ended output would suffice for me too. The Mojo, LPG, QP1R etc and even top tier stuff like the ALO studio six are all single ended.
I've owned my fair share of balanced gear. The ALO International, Oppo HA-1, RSA Protector, RSA SR71B, Lotoo PAW 5000, CLAS Solo -dB and the Glove Audio A1. I'd say only the Oppo, SR71B and Glove Audio A1 made a significant difference (with full size cans). Pretty pointless in a DAP for my usage with IEMs. The Opus1 though is supposed to be better from the balanced out, everyone seems to concur with this point of view.
There's no QP1R replacement slated is there? Judging by price alone, it will still remain their flagship DAP?