I am a student of Teoul Moon Kung Fu at the Five Animal Kung Fu Academy in the northern Pittsburgh area. I can assure you wudangmountain that Master Yim is the "real deal." I am so lucky to have met him on two occasions when he visited the US. What is so striking about Master Yim is how humble and how nice of a man he is. He cares so much about your development as a martial artist and as a human being. He is so unlike many of the egotistical martial artists that I have met over the years. I do not know Master Yim's age (maybe 50 or so), but his skill is unbelievable. He truly practices what he preaches!!!
As far as similarities with other styles, it totally makes sense. No martial art exists in a vacuum, especially Chinese martial arts. I am glad to call af sting and Sholo86 my kung fu brothers, while calling Master killer my kung fu cousin. :)