They have really good burgers - nice and juicy, not too big, reasonable price ($4.90+tx for a cheeseburger). You can add extra toppings like fried onions and such for an additional fee. I like their onion rings too. Their fries are very mediocre, I found them to be quite bland and unexciting. The texture is similar to McDonald's fries, for comparison. Also, I ordered a portion of half onion rings/half fries but it was really more like fries with 4 onion rings, so keep that in mind.
Service is friendly and efficient. Dilallo is a nice, no-frills burger & sandwich joint. Nothing too spectacular, but I'm glad to have it in my neighborhood. Note that it's cash only!