What’s the general consensus on Trader Joe’s for frugal living?

I keep getting recommended Trader Joe's but I know very little about it other than it being typically for the affluent/upper middle class (or higher). I've never had any interest in it because I'm a frugal shopper. But I am aware that they sell high quality/healthy food products. Is Trader Joe's okay for frugal living? I used to think Grocery Outlet was not ideal for frugal shoppers until I shopped there and realized how many great deals there are. I try to avoid these higher priced/affluent stores like Trader Joe's or Whole Foods when I can shop at a more budget friendly store like Kroger/Food4Less. So please share your thoughts.