SONY head units are very pricey.  The picture quality is superior than the other companies and the head units do come with a lot of goodies.  The XAV-AX5600 is an excellent product but it is not Maestro compatible.  So if you have a vehicle that does not come with a factory camera and have a lot of money, this is your radio. Amazon lists this radio for $450.79 (For a discontinued radio....................that's a lot. 

Specifications

General Features:

• digital multimedia receiver with AM/FM tuner (does not play CDs)
• 6.95" capacitive bezel-less touchscreen
• Bluetooth hands-free calling and audio streaming

Smartphone Features (see Details for info on compatibility with specific smartphones and apps):

• Apple CarPlay and Android Auto compatible
• WebLink for additional app access with Android and iOS

Audio/video Features:

• plays MP3, WMA, AAC, and FLAC music files
• 10-band graphic equalizer
• high- and low-pass filters
• Extra Bass for more refined low-frequency boost
• Dynamic Stage Organizer for improving stereo image

Expandability:

• compatible with SiriusXM's aftermarket satellite radio tuner (sold separately, subscription required)
• inputs: two rear USB ports, HDMI input, rear-view camera input
• outputs: 5-channel preamp outputs (5-volt front, rear, mono sub)

Other Information:

• wired connection to parking brake required to access settings and other features on this receiver (the brake must be connected and set for video display)
• built-in internal amp (20 watts RMS CTA-2006/55 peak x 4 channels)
• wireless remote
• compatible with most factory steering wheel audio controls (adapter required)
• super-fast start up time