Review on Bovee tune2air Bluetooth Car Kit for Audi, VW, and MB - Music Interface Adaptor for in-car iPod Integration (WMA3000A AMI/MDI/MMI Connector) by Tony Wylie

Tl;dr: product "works" you plug it in, plug it in and music plays. It disconnects after 10 minutes and reconnects after a minute. If you're using Spotify for music, the song that's playing when you reconnect is most likely coming from your device's default music player (or one that has "hardcoded" songs on your phone). You turn off the car and leave, but Bluetooth stays on and connected. Manually disabling does nothing as Bovee's device aggressively reconnects, disabling the device does nothing as Bovee remembers your devices and aggressively attempts to restore your device. Obviously the solution is to disconnect your device every time it fails the purpose. There are media controls for changing tracks, but they're minimal (previous and next) with no media information to display. Honestly, it's a waste of money, just buy a bluetooth wireless adapter if you think about this product. For now I'm just going back to AMI's solution for 3.5mm. Tested by Audi A4 Prestige S-Line 2012.