Interesting read.
I'm about to order either the Eonon GA1556X or the Xtrons PF7553BA as we speak.
Haven't really figured out if there's much difference between these units, same pricerange, mostly same hardware/software.
Xtrons is Android 5.1 Lollipop, but i guess there shouldn't be a problem updating the Eonon unit..?

Trying to get an answer from Xtrons about the 5 m extension cable that Eonon claims i need?
(Don't really understand why i need it, doesn't the OEM cable connect to the units17/40 pin cable loom?)

I assume you looked into both units before you desided to go for the Eonon unit?
May i ask why you choosed Eonon over Xtrons?
(I'm asking because i have no idea if they're basicly the same units?)

It's a must that the reverse cam works, the missus is, ehhh incapable of backing vehicles :-/