As I've read, and also experienced myself, one of the big issues these Android Rearview mirrors have is that they only come with either 512mb or 1gb or system storage.
That leaves you practically unable to install many applications (or any if you have the 512 version).
Thankfully, I've found this mirror that finally comes with a decent system storage of 16gb!
Check it out:
MediaTek 8382 Quad core @ 1.3 Ghz
16GB System Storage
Mali 400 MP
SD up to 32GB
1280x480 6.86 Screen
3G + Wifi