Just been introduced to it a couple of weeks ago. I like green tea but it can make me feel a bit sick. Redbush is sweeter than green tea and is better for you. So far I have not been feeling sick when drinking it 
Give it a try:
http://www.tetley.co.uk/Redbush
http://en.wikipedia.org/wiki/Rooibos

Give it a try:
http://www.tetley.co.uk/Redbush
http://en.wikipedia.org/wiki/Rooibos