Have tried this tea, and is safe for me (with acid reflux). I don't think anyone can make a definitive and general statement on this though. It seems like different foods/beverages bring acid reflux on for different people. I think the best idea is to try a little bit on a good day (reflux-wise) and see how you fare.
Computer Games Designer, Rugby Player and Acid Reflux Sufferer. Favorite resources for the latter include Heartburn at about.com
, Acid Reflux
, and the Mayo Clinic