For me Trader Joe's is a store to supplement my weekly shopping, but not a necessary destination. I find their prices are much higher on produce and beverages than other stores in my area, I'm not a fan of packaged meat and prepackaged baked goods. So I don't even look at those.
I think Kringles can give you sugar shock.
I like their small floral department and think it's very reasonably priced.
May of their products are one and done. Try it but won't buy again. Then they have some items I buy time and time again. Maple nut cereal, key lime pie, Belgium waffles, pizza dough and sauce. But you have to watch their expiration dates on some items. Not much lead time. To me it really is a trial and error experience.
I do like some of the holiday novelty items. Some with cute packaging making cute stocking stuffer gifts.