After reading the stellar reviews for this app, I decided to take the plunge and purchase Shipments. Having used it for a while, I can only assume that most of these reviews, if not all of them, were solicited from friends and family. Its a good-looking app, but the performance is lacking. Compared to other package-tracking apps I use, this one falls way short. The notifications are few and far between, and quite slow. Also, once you enter the data for a package, theres no way to go back and edit it.
I must say I am very disappointed with this app.
thewarbler about Shipments - Package Tracker