PAC-PDLC81 line converter, blender and aux Muxer... Too good to be true?

Options
https://www.amazon.com/PAC-PDLC81-8-Channel-Intelligent-Converter/dp/B00C86UZS6

Any thoughts?
I'm liking the idea of being able to switch the amps to an aux input with the push of a dedicated dash-mounted volume knob... and the ability to push the 8ch outputs I need from the 4ch inputs (line level from factory head) without rca splitters...

Quality of PAC digital signal devices?
Have a better idea for $100 bucks?