Of the three apple stores in town, this location (Town Square) is probably the most busy.
Genius Bar appointments for service or even workshops fill up much faster than the other stores. The employees say its because locals prefer coming to Town Square rather than competing with tourists on the Strip at the Fashion Show/Forum Shops. Filled up appointment spots also means that this store often runs behind on scheduling. Waiting 10-15 minutes past your appointment is not uncommon on their busier days.
So yeah, this store gets a little packed but other than that its pretty much the same as the other ones in town. Apple has done a great job in creating a uniform customer service experience regardless of which Apple store you visit. The service is friendly, the employees are helpful but not pushy. The demos and set-ups look like any other Apple retail store, and they consistently have their products in stock. Book an appointment early if you need the Genius Bar, and remember there is a convenient parking garage right behind the store!