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As long as you pay off before the statement cycles, your reported utilization will remain low. AMEX is a premium card allowing you to go to the limit and sometimes beyond mid cycle. Again, it's the balance at the end of the statement cycle that you want to keep an eye on.
Keep in mind that your first 30 days may require you to contact customer service to make more than one payment.
Edit: grammar
+1 Also, Amex rarely reports cards to the credit bureaus until the 2nd statement. Certainly don't miss out on the SkyMiles welcome offer, though. 60k SMs are worth a bare minimum of $720!