Put me down as a very happy camper with the Eonon GA6166 in my NAV/non-DSP E53 and with a speaker upgrade courtesy of this thread
https://xoutpost.com/bmw-sav-forums/...-speakers.html
Although I have nothing but the OE system to compare it to, I just love driving in my E53 with the new Eonon HU and speaker upgrade.
I also retrofitted the OE DSP subwoofer unit and it's now driven on the low RCA inputs (previously used the high audio inputs) of my Razon aftermarket mono amp.
Mike