If you're in Phoenix and are a fan of modern and contemporary art, you would probably enjoy a visit to this museum. The collection is especially strong in these areas. I don't know if I'd fork out the admission price based on the rest of the collection, but the museum is open late on Wednesday nights and admission is free from 3-9, so that's a good way to check it out.
I really felt that the contemporary art collection had the best pieces. I really loved the Josiah McElheny (The Last Scattering Surface) in the entrance and the Anish Kapoor sculpture (Upside Down Inside Out). You know Kapoor as the artist responsible for Chicago's "bean" (Cloudgate) and this work is obviously along the same vein. One of the newer items in the collection is a James Turrell that has a prominent spot on the ground floor. And they have an amazing Kusama installation that should not be missed.
There are also a few paintings that I really enjoyed - Georgia O'Keefe - Pink Abstraction, Joseph Stella - Flowers, Italy, Frida Kahlo - The Suicide of Dorothy Hale. I especially loved the Kahlo and how the painting spills onto the frame.
The museum gift shop had a lot of unique items (especially for kids and jewelry), so be sure to factor that into your visit.