My husband and I frequent Hillside. We started off just going for breakfast (great breakfast burritos, by the way!) and then decided to try out their dinners. Their food is awesome! I've liked just about everything I've tried, with the exception being the fish tacos, and even those weren't bad, just mediocre.
Our favorites there are the guacamole as an appetizer, the carne asada torta (My husband raves about this one.), the chicken sandwich, and the salads. Their fries are amazing, especially if you ask for a side of their homemade ranch.
My complaint with Hillside is the service. On a few occasions, we've gotten waiters that aren't particularly friendly and forget to check in on us to see if we need anything. And during peak times, they sometimes have dropped the ball and forgotten to bring out appetizers or drinks. That being said, we look past the occasionally lackluster service and still dine their frequently. The food keeps us going back. Oh, and try the chocolate chip cookies!
Also... they have half-price bottles of wine on Wednesdays, ribs on Thursdays and craft beer night is also that night.