I had fine memories of Hackney's from when I lived in Chicago back in the late '60's.  It was a great burger.  Hackney's still builds a good burger, but it just wasn't as I remembered it.  The dark rye seems softer and the burger itself seemed more fabricated.

Great onion loaf.  As good as I remember.  Pretty sure this is a Hackney's invention.

The inside dining room was packed.  Great atmosphere in there.  But rather than wait, I ate outside in their patio.  Delightful.