http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1402516876
What’s the difference between Yuen Kei San Wing Chun and Yip Man Wing Chun?
This looks like a job for…[SIZE=3]Rene Ritchie![/SIZE] 
Besides asking Rene for his opinions Read Rene’s book on YKS/SN wc (Unique publications). I bought my copy a long time ago.
And authors generally dont make money- so buying is a good idea.
David Peterson also engaged in a labor of love in coming out with his book on Wing Shon Leung and WSL’s overall perspective on Yip man wing chun.
Both good books but neither are how to cook books.
rene indeed
rene is poyfect for the job. now where the heck is the big guy? he’s a bit missed.
Here’s a YKS site you could look at:
There’s a good Chinese saying that covers this: “Big same small different.”
If you have any specific questions in mind, please let me know.
Rgds,
RR