I cannot recommend buying the ESPN fantasy football app in its current state. I bought it yesterday while I was away from home as I wanted to manage my ESPN-based fantasy football team. I should have paid attention to the reviews.
While I am able to log in just fine, the app is very buggy. I've had numerous crash-to-springboards while checking player stats, and I've encountered numerous ESPN server timeouts. The last timeout occurred while I was trying to show someone the app in my office while connected to wifi.
To add insult to injury, ESPN has banner ads in the application. Banner ads on a $4.99 application! What an insult!
This app is not ready for primetime and it was clearly rushed out to the market to make the start of the season. I've written to Apple and ESPN to ask for a refund. ESPN wrote back to say that they are aware of the server issues, and that I should try again. I did that and still got server timeout messages.
This is a very frustrating app. The Safari web browser works as well, if not better than this app.
FYI - I'm running on a 32GB iPhone 3GS with 15 GB free.
Buyer beware.
--DotComCTO
P.S. And before someone asks, I'm no iPhone n00b. I own hundreds of iPhone apps and have had an iPhone since the initial launch. This is the first app where I've had consistent operational issues.