The salad bar is great. (Although I wish there was some bread to go with it, or else that they'd always have a grain such as corn or quinoa as one of the salad ingredient choices.)
However, the soup bar is not of high interest to vegetarians in my experience. Each time I went there (which was 3 times over a period of a couple months), the only vegetarian soup was the same potato soup.
(I only went there on weekends, so I don't know if the menu changes only on weekdays?)
Also, I didn't see the warm pastas change. The vegetarian ones were always spaghetti with a marinara sauce, vegetable lasagna (with very few vegetables), and macaroni and cheese.
It thus got kinda boring to do repeat visits there. I basically only went back when I was hungry enough that I wanted the all-you-can-eat.
The supposedly warm dishes were kinda cold on at least one visit.
Cons: always the same one vegetarian soup, some dishes not always kept warm enough, no bread to go with salad