I'm pretty sure Dynavin can work with DSP. Fmugur did it with his Hualigan, which has the same outputs as Dynavin, Eonon, etc.

As for OBC, you will have to leave the old HU unit in the glovebox & attached, if you want to see the stuff on your dash. Dynavin has some OBC functions, but it seems it buggers up the A/C or HVAC, and now it comes with this function disabled. You can enable it by request (Jeff @ jandtdistributing.com).
The radio sound is improved over all the other models. It uses the double tuner (or similar - which filters the best reception), and the sound is on par with the OEM unit.

Looks pretty much OEM, but the design of the dash is not friendly, and you will have sun glare no matter what you do. Will work best after and before sunset - but this is for any unit.

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Stable: e92is, e46 M54B25, e83 N52, e53 N62 - sold, e39 M54B30 R.I.P.