It was a good grocery store with decent produce, a good frozen section, some nice specialty items, and some decent prepared meals. I would put it at roughly the early-2010s era of Whole Foods with slightly better prices. Now that I'm no longer working near there, I don't miss it much.
So I've never understood the hype. But I've also been told that the Boston stores were pretty mediocre compared to the ones in NY and especially Ithaca.