At the moment Jinteki can play four 3/2 agendas and three Medical Breakthrough which gives them six agendas they can easily score out of hand.
There is the downside of the runner cannot have made a successful run on their last turn. Fortunately, Jinteki have some dangerous ICE which makes the runner more cautious in the early game allowing you some chances to use Shipment From Tennin.
Other than allowing you to fast advance agendas, the other big advantage with Shipment From Tennin is that it is so cheap. Other fast advance enablers such as Biotic Labor and SanSan City Grid will cost you 7-8 to score a 3/2 from hand. With Shipment From Tennin you can score a 3/2 from hand for only three credits - hardly giving up any tempo.
At least until rotation occurs, this has opened up a new archetype - Jinteki Fast Advance.