So I have the RS520 for a couple of months now. Last year I briefly owned a RS250, but I did not like the soud and thought it was not at all user friendly. The manual was horrible and there was no decent explanation on all functions
Also all the fun elements (like VU meters and Rose FM, RoseTube) did not work with all types of input (VU meters). So I sold it after a couple of weeks.
The RS520 experience is much the same.
On the upside:
Sound has much improved on clarity, sound stage and placement.
Beautiful design, very well built, beautiful screen
Many options and connections
On the downside:
Still no working manual, it even fails to mention the seperate Wifi/Bluetooth dongle and does still not explain all functionalities properly.
Very hard to use due to strange choices in the OS
VU meters and Equalizer do not function with all sound inputs esp. Spotify. You need a seperate streamer to get these things to work, but that leads to operational issues
Too much Rose software filled with Korean content for eu market
Rose FM does not work properly in eu and has very limited region choices
The screen design is definetely not used to its full potential in most functionalities
Remote functionality is limited and the app design is not easy to use
Though I understand a complicated well featured one-in-all device takes time to understand, this RS520 with the present firmware requires way too much effort.
As a lot of my main issues are the same as with the RS250 from over a year ago, I doubt that future updates will fix the basic problems. It seems the RS is enthousiastically over engineered with a focus on technical challenges. Shame it is still lacking in the OS and design potentials.