The FM signal is a good point - the D2 uses a complex antenna switching unit which doesn't tend to work with aftermarket radios. An antenna power injector works in non-TV cars, but I haven't tried it in mine yet. If you got the DAB option though, would FM even be needed? I don't listen to the radio.
Not sure if the GPS would work with the external antenna on the D2 - it would need an adapter. Again, needs testing. But, as long as you don't have heat reflective glass its simple enough to stick an aftermarket antenna under the rear shelf.
My main hesitation in buying one is sound quality since they don't publish technical specs for them and you have no way of telling what they have cut costs on. With a Kenwood, Alpine etc Android Auto head unit you know the quality will be there, but you lose the OEM look to get it.
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