The Tao Chan Wing Chun Organization and Grandmaster Chi Sim are members of:
Yip Man Martial Arts Association founded by Grandmaster Ip Man, Hong Kong
Ving Tsun Athletic Association, founded by Grandmaster Ip Man
Ip Chun Wing Chun Academy, Hong Kong
World Wing Chun Union, Hong Kong - withdrawal about 5 years ago for reasons of independence
Taego Buddhist Order, South Korea
German Buddhist Union e. V., umbrella organization of all German Buddhists
However, the Tao Chan Wing Chun organization is completely independent of all these organizations in order to fulfil their commitment to restore Shaolin Chan to Wing Chun.
Experience reports of long-term students can be found in the menu item "Association / Grandmasters" in the sub-menu "Reviews"!