Anyone familiar with Grandmaster Sun Yi and his Trad. TKD Association

[Flatfish]

From what I have found there is only one school in my area that teaches "Trad TKD", Chang Hon forms etc. and that is part of Sun Yi's organization. From what little I could find out it seems that grandmaster Yi's TKD originates from Chung Do Kwan but if anyone has any experience with the organiziaton and their training or other relevant info I would love to hear about it.

Thanks,

F