Lulu's is a very convenient place to eat if you live near CMU/Pitt. When I lived on campus my freshmen and sophomore year of CMU, I ate there all the time. Their food is very reasonably priced and they serve pretty generous portions. Oftentimes, I would have enough leftovers for a lunch or dinner the day after.
Lulu's service is pretty spotty and ranges from decent to very slow on different visits, so Lulu's is not that great of a place to go if you are on a timetable. Other than that, their food is pretty good and I particularly enjoy their Pad Thai noodles, crab rangoons, and their bubble tea.