Could people from all lineages tell me the aspects of chi sao in their wing chun. For practitioners that have touched hands with different wing chun, could you tell me your experiences, what did you notice the same, different. Did touching hands with others give you new insight into chi sao and did your chi sao evolve from those experiences. For a practioner who has touched hands with many lineages, yip man, hung suen, pan nam, chee sim, yuen kay san, etc what line did you find the most skillful and inspiring.