Coming from a Fiio X5iii with a pleasant sound and sluggish poor functioning software and 2 SD slots, now, with the R5ii I have a dry not emotional sound with a sluggish and poor software not mature (for instance no functions for car use) or with poor management of functions like the line out function that in my case is NOT automatic; with bugs in the use of Bluetooth commands especially if you try a different player instead of the Hiby one, BT Pairing should be automatic but does not sound before you do an on/off of the BT ... so after that is the BT paired! The hiby player is not really good or functional especially if you think to bring it everyday with you walking ...good luck to practically manage play pause and volume with the lateral buttons in your pocket..forget it....especially if you use the cover, at that point is impossible. Basically you must keep it out of the pocket for everything you want to do all the time.
I installed on it the ONKYO player and the quality sound is much better. Poweramp unfortunately has problems in BT when you put in pause once you play again start the hyby player..even if not opened.
This is an 8.1 just in case you think to use Wavelet.. so no way. The 3.5mm out not really a good sound better to avoid. In balance with class A just a bit better but just because has this dry sound with painful forward mid and high the only way to have something decent is to use the MSEB to have something warmer and with a more balanced sound or equalize.. ...Screen not bright at all in exterior, and the glass on the top look like plastic. If you want to connect to an external dac with a simple office setup for instance a common K5pro +e30 you need a special coaxial cable not in the box (you have to buy the R6 to have it) that is almost impossible to find e in Europe and eventually the only way is to buy in China the Cayin's one.... Since I have the R5ii I forget to enjoy the music because all this nerving stuff. Probably with future updates will be better but this is the same story like fiio ...we are the tester and possibly after 2 years of updates you have something decently working.