Diet products are not very popular with local Taiwanese, since most Starbucks serve locals they change the menus for locals. As a forgiener in Taiwan, the thing that bothered me the most was that Staurbucks did not have Wi-fi like t-mobile in the USA Starbucks ( I wrote a letter to them about it, and now they have Wi-fi (They even called me back about my letter)). The same for McD's, they have rice burgers which I can not find here in California, and omit some itmes found here in California like diet drinks. Same with 7-11 (Japanese company), which if different from Japan and Taiwan.