The big buffet is Sunday from 2-6 only. Not sure what the menu looks like other days. For a first time gringo, I'd say there is a learning curve: so many dishes, not very clear what all of them are, which have cheese and which don't, what the sauces are, and which plates they go with. If I could, I'd go every week and figure out out! Since it's not in El Centro, it would've been nice to take a bus there, but the bus never cam (probably a light Sunday schedule).
It was VERY nice to see so many Mexicans interested in vegetarianism, even if it is ovolacto. Mexico is a tough place for a vegetarian, at least if you're eating in restaurants.
Cons: ovolacto, dishes could be better labeled for us gringos, not close to Zocalo.