I put an Xtrons Android RNS-E clone into my B6 S4 a few months ago.
Had all the toys and looked great in the dashboard, came with all the cables and was a pleasure to use.
It replaced a Pioneer AVIC 980DAB unit that I wanted to change out as it did not look OEM.
Had more functionality, looked better and offered more.
BUT......
The sound quality was not as good as the Pioneer, noticeably so. I suspect lower spec pre amp stage, just not the same money and R&D spent in that area. Thinner in tone, not quite the dynamic range and this was linked up the the standard BOSE system.
Secondly it had noticeable problem with interference, sometimes there and other times not. All wired/ earthed/ insulated as required I just feel that inside the componentry has less £££ invested in it.
Great if you can get one cheap but the Pioneers and Alpines I have used before have given a better quality of sound.
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