I have not seen your post, if you could point me in the right direction I'd love to take a look.
I didn't go with this option for three main reasons, the system would cost over $1k and likely over $2k installed; to replace a system I already paid $2k for. Second, I didn't want to make irreversible change to the system, as I tend to switch vehicles every few years. Lastly, I have the ATT wifi option but travel enough to/through areas with spotty coverage which would result in dropped connection/unable to stream.
On top of that stuff, my wife and I are a huge fan of picking up random movies at redboxs (you can buy blu-rays for $3-4) for the kids to watch while on the road. Not to mention, I'm not a fan of android systems as they, like many other electronics suffer from planned obsolesces syndrome.