Yeah, might be worth trying once or twice just to see if it works out as well as you hope. But personally, I tend more toward Ketchup's cartoon -- why waste space with pasta when even my expensive store sells entire boxes for $0.99? I'd be more likely to focus on the expensive stuff (measured on a $/volume basis, of course, like nuts and blueberries), or the denser veggies that provide a lot of veg for the volume (e.g., no salad).
But don't get caught up in how it's so much a better "deal" than the normally-priced food bar, or that, wow, it is really letting you stock up on nuts for a screaming cheap price -- the key is whether it would cost more than what you would otherwise make at home. If your goal is cheap side dishes, you can easily make some pasta, or rice and beans, or fried rice, or a head of broccoli, or big salads, or whatever for a lot less than $8 per 2-3 meals (there's a reason they offer the deal on "meatless" days). So if you'd otherwise make a pasta salad for $0.99 of pasta and $0.15 of mayo and maybe a quarter's worth of veg, paying $8 for a tray full of nuts won't save you money, even if it's a great deal on nuts. OTOH, if you normally pay $15/wk on fresh veg and then never cook it and it goes bad, paying $8 for a tray might be a reasonable way to cut your real-life costs (even though the optimal approach would be to buy less veg and then cook what you buy). So if you think it's a deal, try the food bar for a week, then try cooking at home for a week, and compare the two.
The other way I'd consider using it would be to improve my diet for a reasonable price -- for ex., I struggle to find vegetables I like, so if they have some version that I like, I might fill 'er up to entice myself to eat more veggies. But note that this would be upgrading my diet for a similarly upgraded price; it is not saving money.