I tried Sendle for 5x parcels and unfortunately not were delivered in a timely manner. Unfortunately courier companies such as Couriers Please that Sendle uses leave packages sit in their depots for up to 7 days before they move. I gave Sendle a try to reduce costs but for the dollar or two saved, I have gone back to Australia Post, Express Post where delivery is withing 1-2 days.
Explained that the Sendle experience was not a fast service. I said fair enough but that's actually what businesses require these days