I love breakfast, but I very rarely ever eat breakfast at a restaurant and think "oh, that's amazing; that's way better than I could have made it." But that's what I think when I eat at Eggs-R-Us. They have the best bacon and hash browns, and for me that really pulls the whole meal together. I honestly don't even know what they serve other than breakfast. (Although if you're eating at someplace called Eggs-R-Us, you should probably be eating the all-day breakfast.)
Great food aside, this place has the typical Pittsburgh restaurant disadvantages of being small, cramped, and old. I definitely would not bring a large party here (I think even 5 people would be too many), and it's popular enough that I try to go on off-hours so we can get a table.