I've been here maybe 6 or 7 times since they opened (I live nearby). I'm definitely going to be a frequent customer this summer. I really enjoy the shop. Great atmosphere, friendly service, great coffee, funky decor, awesome deck seating.
It's a new shop, and they definitely have a few kinks that need ironed out. I've found coffee grounds at the bottom of my cup several times. The baristas need to prepare drinks with a bit more urgency. It's definitely a laid-back store, but if there are more than a couple people ahead of you it might take upwards of half an hour to get your drink. They also need to do something about their chai mix; I got an iced chai and their powdered chair mix does not dissolve well, which resulted in a chalky, chunky beverage. I'm sure those things will improve as they are open longer.
But in all this is about 500 times better than Katerbean, our only other option for coffee in Regent Square. The quality of their coffee is excellent.