Green Well is a quaint, cozy and quiet place that fills a niche for a quality, well-kept, uncrowded tea/coffee shop in New Haven. Its main competitors---Blue State, Koffee, Woodland, Willoughby's---aren't nearly as clean, friendly and comfortable. They also don't offer as high quality products.
I really like that Green Well offers high grade loose-leaf tea. My only gripe is that they rotate the available types by the day, so you have to pick from what's offered. From a behavioral economics perspective, this might actually work, as consumers don't feel overwhelmed by a range of options. From the perspective of a tea expert, having only three options can feel limiting.
I especially enjoy the baked goods here. Their vegan carbon cookies ($1.25) are wonderful---subtly sweet, doughy, moist marvels. Their scones and muffins are also tasty, but I'd prefer ones with more of an emphasis on fruits (blueberries, raspberries, etc.) or straight-up chocolate and vanilla. Carrot-ginger and whatnot aren't as appealing.
It would be great if Green Well also had more vegan options, such as a coconut creme cookie sandwich or something of that type. Cupcakes, even!
I'd also love to see vegan breakfast sandwiches. How about a marinated turmeric and garam masala tofu patty, some soy sausage, and a whole wheat bagel or English muffin? That would be superb and no one else in town offers it.
On a whole, this is a lovely space and a great place to get a cup of tea or coffee. It's not crowded, it's clean and well-lit and has really friendly staff.