I could go on and on about all the reasons I love Trader Joe's - the freshness of the food, the low prices for organic, the unique items (e.g., spicy dried mango or dried mangosteen), the cheap wine. But the best reason by far is their outstanding, boundary-breaking customer service.
I've told many of my friends the story of a time when I was in the checkout buying an unusual item, and the checker asked me if I had tried said item. I replied that I had tried a similar item, but didn't like it, so I was going to test out this new option. She promptly rang her bell and received approval from the manager to give me full credit for the item I bought previously - I had no receipt, no box, no proof whatsoever that I had ever even purchased the item! Further, she informed me that I could always ask a Trader Joe's employee to open any item and let me try it there in the store before purchasing! Wow!
Here is yet another story about their outstanding customer service - they gave a woman a free turkey simply because they felt sorry for her!