not to put the mockers on some of this
,
But my dad had a Radio Guy supplied unit in his Little Merc , and it was a Dynavin, and nothing special , just a typical bit of Chinese tech it was too , very similar in quality to those Navall he sold at the time .
but was very ( mercedes) expensive at the time .
but did mostly work .
your Choices are limited to chinese made items, or big name brands with Big prices ( don't look inside to see where they are made
) .
Still got a WinCE unit in the V8 ( duff card reader) , and an xtrons android in the CDTI. both work but the Android, has the occcasional hiccup, loses stations and boots with a block screen ( rare) .