I have never met YanMing ...
... however I have met many times his disciples Heng Xin (Austrian guy who spent 10 years with YanMing at the Manhattan Temple) and Heng Yi (Chinese guy who grew up at the WuShu Guan) ... both of whom now run the Austrian Temple affiliated with NYC.
They are great guys, animated by truly positive spirit and passion for Shaolin Wu and Chan, teaching a solid mix of traditional and modern Shaolin martial arts with a good base of philosophy too. They don't have the ego-drive or Shifu-worship that many Shaolin disciples unfortunately display, but just a healthy respect for their Master and a healthy bond with their students.
So, if the mark of a Master is the teachers he "produces", well then YanMing in my opinion must be a great Master with great spirit.
On the technical side the only things I'd "add" to what these two disciples do, and I don't know if that's something lacking also in NYC, are applications and some combat training: they don't do any practical application of techniques, even for more advanced students.
Wall
> it is your mind, that creates this world >