Our seats in 323 were almost perfectly aligned with third base. Anything encircling home plate extending from first to third base is a great seat at Chase field. The upper corners are a little less desirable and that's why they're priced so cheaply.
Overall, 323 gives Diamondbacks fans an excellent panoramic view of the field. Combine that with an air conditioned climate and the ability to escape the Phoenix heat and you've got yourself a great experience.

Keep in mind that from the lower level, you'll be able to see the game when you're visiting the concourse for concessions but you can't do that from the upper level. You always get what you pay for at these ballparks so if you don't want to sit in the 300s, save up your money for some great seats.