It's an entire enterprise centered on salads, customized and created right in front of you. And that's enough alliteration for one review.
The value proposition is VERY simple. If you want a salad, and you want to have a lot of control over what goes into it chosen from a variety of options, then go here. If you want anything else in the world, don't go here (they have other menu items, but nothing that can't be beat elsewhere).
I will give a special mention of their beverage selection. Pretty good unsweetened iced tea sits next to a fountain with multiple Boylan brand (whoops) sodas. Better than your normal soft drink offerings.
(Oh, and because you have to basically go down the counter with someone as he or she makes your salad, I think it would be a hard place to go with groups, since there will be substantial lag in between the times the first and last people receive their salads--though it's not as big a problem as it would be at other restaurants, since you don't have to worry about your salad getting cold.)