I come here frequently for work and i HIGHLY recommend an appointment with the genius bar. The store can be crowded and scheduling ahead of time can cut down on waiting. Without an appointment wait times can exceed 1 hour.
It depends on what you are there for. Yes, if you need assistance with a repair, a class on them teaching you something about a newly purchased product or something like that. However. If making a purchase or something of that nature, no.
Yes
No appointments needed but try to go earlier the better.
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