I own the QP1R and was one of the first few people to own one of the units. I have found this DAP unrivaled in sound to many others, while being able to drive different cans and IEMs with little problem. The wheel does have problems and I won't try to lie about it. However, I did use it a while and it did loosen a bit. Strangely enough, I did vacuum around the wheel and it make it nice and now turns nicely.
As for the software issues, the QP1R on v1.0.5 has no problems I can report. After every update, I always do a reset to make sure the settings are refreshed. Its recommended by Questyle to do so. Honestly, I would love to see the Onkyo DP-X1 get dropped.