We have one 1/2 mi from our house. It was recently renovated. The quality of the food is very good, prices are very low (like Costco but small quantities) and the produce freshness is excellent. That being said, you can only buy the high volume stuff there - forget about shallots and artichokes. It doesn't have as much gourmet stuff as Trader Joes, or a big selection of energy bars, but it does carry a good selection of a lot of organic items and even grass fed beef. They also have an isle of rotating seasonal stuff, like beach toys and phone chargers.
For example, Aldi organic ketchup is $1.80, the Heinz version is $5 at other stores. They are even cheaper than Meijer. Bags cost extra, so bring your own.
The downside is that they tend to run out of produce late in the day, and hours are more limited (9-8 most days). Aldi carries a lot of house brands, but quality is good. There is decent selection of wine and craft beer too. Payment methods are cash, CC or ApplePay, and you are always out in < 5 min.
I almost always walk and bring a few bags, and go a few times per week.