With the release of Reaver, Harbinger now has a lot more utility outside of Apex decks. Any deck running Aesop's Pawnshop and Reaver should consider splashing another 3 influence to slot 3 Harbingers.
Installing 1 Harbinger for a click gives the runner 6 credits and 2 card draws over the next 2 turns once the engine is set up. Being a program, Harbinger also fires Technical Writer for an additional 1-3 credits to be collected when required. 1 click for 6-9 credits and 2 cards is pretty nuts, and Hayley goes one step further by allowing you to install 2 Harbingers in 1 click. That's 12-18 credits and 4 cards being drawn for a click (over 4 turns though). Using a Clone Chip to bring Harbinger back (making sure to fire the Clone Chip on the corps turn for that extra draw from Reaver) just makes sure Aesop is never out of stock.
On top of this, whilst Harbinger is waiting to be sold by Aesop, he acts as a great target if the corp forces the runner to trash an installed card (like Power shutdown).
7 influence for Reaver for 3 Harbingers out of Shaper is a steep ask, and you if you have to import Aesops too the total influence hits 13 which is something only Sunny would seriously consider.