Puerh brews dark like coffee, but actually has a very mellow flavor. The fermentation process removes most of the bitter tea taste, and highlights its aged, earthy notes. As a bonus, caffeine in Pu-erh tea is absorbed by your body at a slower rate, so you can avoid the jitters and a crash of an instant caffeine hit.
Puerh is best enjoyed in the morning to set you up for a productive, stress free day, or after a heavy meal to gently aid digestion.