- iOS7+ only
- Does not allow you to view/extract your private key
- Does not import existing keys
What this basically means is you have no way of controlling your wallet outside of the app.
I would NOT recommend such a solution to hold the bulk of your funds, ever. Keep them somewhere else, QT, a paper wallet, even Dogetipbot, and only transfer in what you need to spend.
Look up Doughwallet.