I like Aldi Süd (the one you Americans have and also the one in the UK) but here in Hamburg and also in France it is Aldi Nord and it's really quite awful (more like Netto and Penny, both of which I hate). Thankfully we also have Lidl which is closer to Aldi Süd but honestly I'm a bit soured on Discounters in general recently. I still use them for some things but often they're more expensive than my local greengrocer…
What would give you the indication that the situation is different in the US? In any given week I shop at Aldi (Favorite), Trader Joes, HEB, Whole Foods, Costco and Wal-Mart.
I'm consistently shocked by which stores have the best prices AND best quality produce.