It's just a place to pass time and eat. I usually come here when it's not to busy. Don't come to the SU when it's crowded and expect a seat. The service is alright, when you need something don't be afraid to ask. IT is pretty helpful and front desk will tell you when they have scantrons again.
The food, it's the normal price as going outside to the actual fast food venue, but if you use your Rebel card or dinning, you do get a discount.
The study rooms are super comfy, and I go there often to rest, relax, and sometimes study, but it's preference on where you like to study.