This place is sometimes great, sometimes less than great. Hands down one of the best features is the really delicious and cheap sandwiches you can get from the sandwich line (I'm partial to the vegan chicken salad myself). But one of the weaknesses is the inconsistent customer service. The last time I was in there, the girl who made my sandwich acted like I was seriously inconveniencing her by showing up to order food. Sorry, I apologize for wanting to give your co-op my money!
Also, I wouldn't recommend making a special trip to try to find this place. It's buried in the student union, and parking isn't cheap if you don't already have a reason to be on campus. This co-op is a blessing for vegetarian and vegan students at UMD, but it's not very accessible for the general public in its current form.
Cons: Inconsistent Customer Service, Difficult to Find