Dr. Sun died in 2009, but the school he started in Philadelphia lives on
http://siulum.com/ – there are videos and his two books for sale
here’s a link to a video of him doing Wind-Fire Wheels (mostly Yang-style Tai Chi long form)
and for a Choy Lay Fut version
peformed by Sifu Evelina Lengyel of Concord (CA) Kung Fu Academy [a member of Grandmaster Doc-Fai Wong’s Plum Blossom International Federation]
http://concordkungfu.com/pages/academy/sifu_evelina_lengyel.htm
Things get tactically interesting when the weapons are not symmetric