I had a two-week rotation at UH, and during that two weeks I was a customer of Einstein's an embarrassing number of times.
The employees aren't the most cheerful people in the world, but they're efficient. Order accuracy is never a problem. They make a good cappuccino, and apparently the mocha is good as well. I don't love their bagels compared to their competitors, but in sandwich form I tend to like them. I wasn't a huge fan of the Nova lox sandwich, but a turkey option I tried turned out pretty well. The pizza bagel is a good choice for a cheap option, if not a calorically friendly one.
Cheaper than Wolfgang Puck and arguably better than the main cafeteria.