The quality of the coffee is great, their lattes are definitely of a higher end than the regular Starbucks. I find their quality is comparable to Artiggiano - mind you, I really like Artiggiano so that's a compliment.
The flipside of this chain is the price, their coffees are way overpriced for what they are. For example, a large latte comes to about $6 after tax. I understand that they have this fair trade, organic, yada yada concept but even for those standards I find it difficult to justify to myself paying that kind of price for a coffee, especially when I can get a similar quality at Artiggiano for a much better bang for the buck.
As for ambience, I find their stores to have a pretty standard coffee shop feel, and the same goes for the menu of pastries and food. I think it's ok for a very occasional treat, but I would probably not consider becoming a regular here.