The Chuck Box is a staple for any Arizonan as its been at the Tempe location for over 30 years. Sadly the Scottsdale location (Taken over by Oreganos in about 2003) was much closer to where I was raised.
If you are a fan of IN&Out and 5 Guys, and want to change it up, I think this place is a great place to go.
The burgers are some of the best chuck you will find, grilled over mesquite wood which gives it a savry smoky flavor. They cook the burgers right in front of you if you desire to wait in line, or they will just yell out what order is up while you grab a seat. Toppings are self serve and fresh. The burgers come in sizes of "a great big one" (3/4 lb), big one (1/2 lb), and a little one (1/3 lb). Make sure to order the fries extra crispy, though onion rings and fried zucchini are local favorites.
I recommend anyone visiting Phoenix and claims to be a hamburger aficioando, to try this place. Be mindful of the Cash Only concept.