The interface of the Mac app mirrors that found on the iPad, but with the same design language found in OS X Yosemite. By no means does it look like an iPad app. The column on the left displays your shipments, complete with color-coded bars for each carrier — purple indicates FedEx, brown is for UPS, and so on.
When you select an entry, the right side of the window splits into two. The top half offers a map showing the location of the package along with your current location. The bottom half gives relevant details such as the package's name and tracking number, the last time the info was updated, and the expected arrival date. You can click the "View details online" button for more information, but you probably won't need to.
The Today widget mimics the list of shipments in the app, just without color coding or excessive details. You'll only find a countdown of days until the shipment arrives, the package's name, and its most recent status.
While that info might be enough for some, I would love to be able to see whether a package requires a signature, and if it does, the expected delivery timeframe so I know when to be available to sign. Right now, I have to click on a button that takes me to the carrier's website and hunt down the information myself.
Deliveries is a step up from the (still available) Dashboard widget. Both offer alerts and package tracking, but the app offers deeper integration with OS X and takes advantage of the new Extensions functionality we all love in Yosemite.
The additional methods for adding packages to your Deliveries account, combined with the Today widget for quick access has made Deliveries an invaluable app to me. I send and receive countless packages on a weekly basis, and to be honest, it'd drive me mad if I had to manually keep track of each one using the UPS or FedEx site.
Is it worth the $5 price tag? For me, without a doubt. But for those who only have to worry about a couple packages a month, tracking through a web page is probably the better option.
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