It is a hassle.

The app is okay, freezes up sometimes and it lags a bit when you try to submit and answer, so hopefully your teacher leaves the question up for a long time. Also, once your trial is over you have to buy. What is difficult is that you have to get on iTunes, then load money on iTunes, then finally go back to your Reef account, log back into your iTunes, and can finally buy it. It would be so much easier to just write up a credit card directly from the app.

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