Jason Lau is my Sibak (Sifu's older brother). I have not seen him in a few years, but heard he was no longer teaching, and that one of his senior students was performing the teaching duties. Sibak Jason's Wing Chun is very soft and fluid. He has produced some really good instructors and fighters, so IMO you couldn't go wrong training there.
As for the repelling tower, Jason worked with the military back in the early 1980's. The first time I met him, he came for Dim Sum after just having his students finish training in a repelling session.
I'm assuming you're in or around the Atlanta area, and if so, you can also check out my Sifu's academy. They can also give you some suggestions for Wing Chun in the Atlanta area. Sifu also has a couple of students teaching in and around Atlanta. See link for website.
www.FrancisFongAcademy.com