While my AK hasn’t arrived yet, for me the keyboard and individual outputs were reason enough to upgrade. There is a lot to be said about interface and ease of connection.
On a side note in relation to the Sub37, I used to have a Voyager and while it sounded great I couldn’t justify that much studio real estate for just a single note. Apples and oranges though, so it depends on what works for you and how much space you have.