I shop there regularly. Where ours is located is next door to a
WalMart and across the street from a Wegmans. So typically I will start at Aldi and get as much as I can on my list from there, then whatever's left or if I have specialty items to get like olive bar type stuff then I finish up at Wegmans (or Walmart if needed).
I save a ton of money doing this as opposed to getting all my groceries from Wegmans. Yesterday I bought almond milk, cool whip, ice cream sandwiches, 1/2 gal ice cream, 2 things of mints and a bag of pita chips for $10. Not everything is a huge savings but a lot of things are. After you go for a while you get into the groove of what you normally like to but there and what you save for your big grocery store.
Some weeks the produce looks awesome and then other times not as great, so again I play that by ear and finish up produce at Wegmans if I need it.
My regular type purchases there are produce, snacks, cheese, salmon, canned goods, ice cream, cookies, almond milk, coffee creamer. Their brands are "Benton's" and "Sundae Shoppe" -- which are their store brands basically. Sometimes they have name brand stuff but it is random. Their Benton's girl scout cookie copies taste exactly like regular girl scout cookies.
In the summer they also have a lot of random, limited items like hanging flowers, one year I got a little Japanese maple tree, outdoor stuff... They have this sort of rotating products year round, you can check their flyer on the website by date to see what they're getting in.
Just remember your resuseable bags and a quarter for your shopping cart.
Also remember Aldi seems to vary across the country, we have some good ones here (including the one I frequent) and one kind of crappy one. So YMMV.