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Specs are impressive...
however, two very important things:
ease of installation
and reliability over period of time...
I noticed on the picture that the OE connector had round pins, E53 has gone from round pins on earlier models to flat pins (radio connector), so that could be one issue...
also, on the models with factory Nav, most of the audio routing is done in the trunk, and the front display is just that, a display, so one would need to somehow route the cables back to the trunk... On the ones without the factory Nav, the radio is already at the front of the car but there is a metal bar that separates the radio from the MID, which needs to be hacked away in order to fit a solid display module... those are just couple of installation moments...
on the reliability - it is rather more often than not, that a Chinese no name barnd item has a lot of promises but fails to deliver on a long run - i've had cell phones, chargers, mp3 players, SD cards that were good deals on the paper and the specs but the item either fell apart after a week of use, or was slightly different in size (a battery was 1/2 mm too big), or just stopped performing altogether...
the only way to see if this system is good, is to buy it, test drive it and hope that the seller will take it back if the thing falls through...
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