Recently started using the built-in Pandora integration on the RLX entertainment system and have been very impressed with it so far. It just works.

Launching the Pandora app on my Bluetooth connected iPhone automatically detects the RLX Ent. System and immediately goes into "accessory mode". From there it transfers all display, control and playback information of the app directly to the RLX touchscreen and starts streaming the audio playback through the car stereo. Since my iPhone is on LTE, I'm streaming anywhere I have good signal coverage.

Every function of the Pandora UI is available through the RLX touchscreen UI, including station selection, creating likes/bookmarks, etc.

 

I wish there was support for more popular streaming apps, such as Spotify.