Curiosity got the better of me so I went ahead and installed the app...
I'm actually somewhat impressed with how well it's laid out, the features and information available, and the UI. All of it very well done, and much better than my somewhat high expectations.
That being said... there's only one thing about it that bugs me, and that is you have to exit out and restart to get back to the league select screen. Not a deal breaker, but I'm somewhat surprised there's no method (at least from what I've seen playing with it) to return to the login screen where you can choose between leagues.
[edit]After a reboot, the aforementioned bug disappears and the app works famously. After more playing with the app, the more I am quite happy with it, and a few times was amazed at some of the features. If you're serious about your ESPN Fantasy Football Leagues, this is the app for you!
I'm curious to see what HuddleHub does, but I will say they will be hard pressed to incorporate ESPN as well as this app does. Kudos to the devs who built the app.