When my daughter's Mac started acting strange, I suggested that she make an appointment with the Genius Bar at the Apple Store here. We arrived about a half hour early for the appointment and while it would have been nice to been seen, there were other "patients" and we were only seen by John at the time of our appointment. Plenty to look at in the meanwhile and the Apple Store has their own wifi so we didn't have to use the icky "mall" network.
John was a consummate professional, diagnosing the problem quickly and making a recommendation. The Mac now operates much better and the initial problem has gone away. No charge.
Big glass windows at the front of the store, tables throughout with the latest Apple gadgetry on display and ready to be demo'ed.
Five stars.