Though I've lived in Phoenix for 14 years my first visit to the Herberger was just this week. I'm glad I went. We saw a production in a side theater - Stage West - and there wasn't a bad seat in the place. In fact, there's a tip - you don't need the more expensive seats to see everything. Even the balcony seats are close.
Good acoustics, comfortable seats, friendly staff, and a limited bar /snack stand.
Even an art gallery upstairs if you have time to kill before the show.
Ample parking in the lot next-door, and on-street parking if you get there early. Also close to the light rail. Great place to see a show.