As I have stated several times.....I have HD radio (high end units) in two of my vehicles and try as I might I cannot tell the difference between regular FM and HD. They were both offered as original equipment but I sure wouldn't pay extra just for HD.
As I said earlier in another thread I do not listen to any radio in my cars now anyway so all I need is a good amp and a USB port.
What make is this with HD as standard, I am going through heck to find a Ford vehicle with HD and Ford is supposed to be the leader in HD in their vehicles.