I asked the best student of my yang style Tai Chi teacher, that also has his own cheng hsin group and teaches others already(this is cheng hsin: http://www.youtube.com/user/ChengHsin), to let me try some grappling on him. It was in an email and he didnt answer yet. At first I just asked if I could get an idea of his cheng hsin practice first hand, but he answered that his group was closed doors and he offered a single lesson for 30€ so I told him what I'm actually interested in. Am I believing to get a chance? No, but hope dies last. If I get a chance this could be really cool. My teacher says his push hands is very good while looking amazed about how good it is. This could make him hard to take down without going for his legs and even a single leg could become hard against someone with great balance.