So, is it happening where you are, especially in states new to ALDI? Save-A-Lot is down to one California location in Coalinga, over a hundred miles away from the nearest ALDI in Bakersfield. Save-A-Lot stores in L.A., Riverside and San Bernardino counties didn't fare so well and began dropping like flies within weeks of ALDI opening. When you read Yelp reviews for ALDI in California, many positive reviews are from transplanted out-of-staters happy to see a familiar name. Perhaps Save-A-Lot was only a stop gap until the "real" thing arrived.
Grocery Outlet, of course, is a whole different animal specializing in deeply discounted short-dated non-perishable national brands but they also sell dairy, fresh meat and produce at market price to save you a trip. According to many sources, they and ALDI opened more new stores in California than any other grocer.