Best things to learn from a a beta test?

Wondering if anyone has any advice on some of the top findings or learning to take away after a 30 day beta test? Understand that each finding is different depending on the category of the app.

In this case our app is a rewards app that sends users rewards and promotions for getting hit with everyday ads. The top things we are looking for is users to keep the app, how they like the rewards and ultimately how they feel about keeping an app on their phone that really does nothing but send them rewards.

Any thoughts or comments would be great.

Thanks.

The best thing about beta test learning is, it provides the unique opportunity to ensure that as a final step prior to release, all of the product components (including quality, feature/functionality, installation, documentation/training, support, delivery, and more) perform as expected, ultimately providing the intended total customer experience.