The ease of use. It's very simple to get started with and you can customize it to your needs. I love how easy it is to add new classes & workouts. You can also have multiple people working on the same workout, which I like because I'm not good at organizing my own workouts. There isn't an option to do anything you want in the app. If you need to create a training plan, or have other features that aren't included by default, you'll have to pay for those separately. I would say go for it! This has been the most helpful thing in helping me organize and keep track of my workouts.