I wouldn't even think about replacing the factory radio in my wife's 2011 Genesis Coupe. With factory navigation and bluetooth that actually works, she'd probably strangle me if I replaced it with an aftermarket unit that has a half-assed bluetooth implementation.
Currently, I am going to start out with adding a sub to her factory system via LOC since the factory sub suϲks. Later on, I'll consider using a processor such as a BitOne or whatever new stuff comes out at CES next year. It's time to face facts that some factory HUs just can't be replaced without losing features, so I need to figure out another way to work around them.