Thanks for your review Chris. I don't need the AVR since I don't have iDrive. All I really want to do is be able to play music off of a USB stick, which you said you don't have any issues with. So that's good to know.
I'm just getting really frustrated with the GROM unit. Just got a new firmware from them and it still doesn't work properly. I'm going to give them another month, and if they still cannot fix it then I'm going to try the Dension Gateway 500.
E89 Z4 sDrive35i 7DCT "Zayna", Alpine White/Coral Red
E92 335i 6MT "Calixta", Space Grey/Coral Red [Retired]