DO NOT try their samples. Take it from an insider, they do not thoroughly clean the containers.
The tea itself is okay. However, Teavana does not specialize in high quality loose-leaf tea. In fact, you can find better quality tea online for more reasonable prices. It's unfortunate that the company has chosen to push for ingredients that mask the flavor of tea. They used to sell really good green and white teas. Now all the green and whites taste just like their herbals. There is no clear distinction, other than the fact that they are more expensive and supposedly "higher quality".
Tea connoisseurs would be very disappointed with Teavana's "teas".