Not sure I completely understand your question. If you mean should you take the full credit line that they offer you for overdraft then the answer is no. You should NOT use a credit line as over draft at all. You should put some of your money in an account that is sperate, like a savigns account. Then have your bank use that as your overdraft protection. The last thing you need when you run out of money in your account is to go into debt and have to pay interest on it.
If you are asking if you should use your overdraft protection like having a credit card, the answer is again no. Credit cards are stupid, you should just pay cash or debit. Stupid to pay interest on things you can't afford anyway. Just put some cash in account and use that as overdraft.
If that doesn't answer your qestion feel free to explain it in more detail.