I like this masters extension of the art, from what I have seen of it:
http://www.sifuchowwingchun.com/bio.html
Off topic but I remember viewing his vid's back in the VHS days & he had quality demonstrations I didn't care for his terminology for Pak Sau however(He called it patty cake, haha cracked me up a bit)
But his tapes were comprehensive & worth the buy.