I have used the services of both locations (the other being Tempe). The service was consistent at the Phoenix office with that of which I received in Tempe: Awesome.
My review for the Tempe location I believe can directly apply here. So, as all great men do, I will quote myself:
"THINK! is the place to go in the Phoenix Metro for your printing needs. I have used them in the past and was extremely satisfied by the fast service, great pricing, and multiple options available to me. On top of the superb product offerings they provide top notch customer service. I will definitely use them again, and would highly recommend them to anyone. I have used THINK! on several occasions and the level of service and product have been consistently awesome."