From the app itself, you can keep constant track your food. You can see when your order was accepted, when the food's ready, and when the delivery is on its way. That way you know exactly what time you'll be eating dinner.
Just like with Uber, payments are easy and convenient and can be made directly from the app. In the total, you see the cost of both the food and the delivery. And no, tips are not necessary.
UberEATS is an interesting food delivery app that has an elegant presentation and some excellent features. Its main problem is simply that there's a lot of competition with other more established services.
Requires Android 4.1 or higher