Today i seen and compere both navigation units. And with sorry to 1.5L buyers, its a crap in front of 1.8L unit.
The navigation unit found in opening pictures in 1.5L unit. 1.5L unit is Quad core but 32 bit firmware and not performing well. Even front camera is not sync with my hand movements and skipping frames. It had 4.2.2 Android with Quad core 1GHZ Cpu 1 GB ram and 16 GB memory. Touch Button looks pathetic. Both had 8 inches 1024x600 display. 1.5L screen looks gray when its off.
It support rear entertainment system which is optional.