To elaborate on recent threads concerning good examples of wing chun compared to not so good examples I thought I would post some examples of one of the most common problems in wing chun clips available on youtube: this is the start stop nature of anything approaching free movement, be it drilling or examples of light sparring.
The reason why the clip of Jerry exchanging with the xing yi guy is good is that the movement is continuous (as real confrontations are). Start stopping as in the following clip is a very counter productive way to train. You can see it all the way through the different stages. All it trains is attacking against a paralysed opponent and becoming paralysed when attacked.