The espresso frappe at Starbucks is excellent. I haven't really tried anything else, because this drink is so good.
We had coffee then asked for WiFi password, the staff were not at all helpful to the extent of being rude. We had eleven days in Langkawi the people were lovely and very polite except for the end of our holidays when we went for a coffee at Starbuck's in the airport.
It's always comforting to see a Starbucks around. The Moka frapuchino is a must. The attendants are friendly and, of course, the wi-fi is an asset.
This is a typical Starbucks, we found it clean and tidy but best of all Cool with a free WiFi. We stopped for a nice cold coffee drink and sit down on a hot humid day.