I used to have Dynavin N6 for about 3-4 years, happily managed to sell it and bought Avin4. From my experience the Avin is so much better in terms of quality and usability. I quickly got tired of Dynavin with its closed system (can't install new apps) and it would frequently lose sound requiring disconnecting the unit from DSP in the trunk under the spare wheel. Jeff tried to solve it with a replacement unit and other devices to no avail. It was so frustrating to lift the spare wheel to get at the DSP connection. Someone without DSP bought it and was all good. Avin4 has never had such issues and I'm very happy with it.

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'05 E53 X5 4.4i, '97 E39 528, '07 E92 335i, '16 F86 X6M.