A few months ago i bought one of the 10" android units for our cars, The one in the link.
Cheap eBay unit
I found it to be rather slow and after checking it with CPU-Z I found that it only had 1gb of ram which was probably the bottle neck. I was able to have this confirmed with one other person who bought this unit as well. Its so bad that they even have a fake specs page that lists the memory at 2gb but with access to the market its not hard to check with CPU-Z. The ram was a factor but also the software was not great, poorly laid out, and the screen was terrible. I watched a few videos on the YouTube app and it looked like it was 8bit colors.
I have an Atoto in my forester, and an Eonon in my Silverado so i know how nice a good unit can be but this wasnt it. So i started searching and came across a manufacturer that was able to make a custom unit that would have a little more grunt. We settled on a unit with a 10.4" HD screen, PX6 Rockchip, 4GB ram, 32GB rom, better tuner, and better amp. This unit also had both FM, and AM radio, Canbus integration, Built in Android auto and apple carplay, and an optional dash cam. Once i got the new unit i installed it and shared my experiences with the fifth gen legacy group on facebook. There seemed to be a fair amount of interest in the unit so i started a group buy to help people interested in something like this avoid navigating through all of the units out there that arent quite up to snuff.
I have a few youtube videos linked at the bottom with comparisons of the 2 that i had and the install experience with the new one. I also have a link to the group buy being facilitated through my website. Depending on interest ill probably let this go for another week before i put the order in. These can be shipped worldwide and they have an option for the RHD members. They can work with the HK audio nav units with a little extra work, mine was HK with nav and there are a few in the group buy that are also.
Group buy link