Ohhhh, we just had an Aldi open this summer. I'd never been and was skeptical thinking that maybe it'd save us 10% or less....but, been going for several months and it saves us more like 30%!
We buy almost all of our groceries there now. The only things I go elsewhere for now are fake meat products (like boca burgers and morningstar), Asian things (Asian noodles, tofu, etc), and fresh herbs that we don't have in our garden. I've found nuts to cost the same as the store brand/sale price at the grocery store, and everything else I buy there is no more expensive than the super bottom sale price elsewhere and usually considerably less. With this said, my mom has an Aldi near her and it's not nearly as good as ours, so they vary greatly. Things I especially love to buy at Aldi:
-produce!!!!! avocados, berries, watermelon, apples, mushrooms, potatoes, carrots, lettuce, etc, etc, all the produce at super low prices! I have found the quality to be the same as the regular grocery store, if not better. Really no issues.
-milk (almond and regular)
-nuts and dried cherries
-fair trade coffee and dark chocolate
-their brand cheerios (they are different but DD and DH don't mind)
-pretzels and any snacks
-tubs of hummus, especially the spicy one
-cheese/cheese sticks when we buy it for a treat (not often)
-frozen veggies and berries
-whole wheat pasta, wheat gnocchi and tomato sauce
-baking supplies and oils
-whole wheat bread
-taco shells, dried beans, and canned beans
-natural peanut butter and whole fruit (no corn syrup) preserves
Really I could go on and on b/c we buy very close to everything there....I've found all of it to be good, except their brand of nutella. It's not as good, but that's pretty much the only thing I've found so far....