Depending on the country that produced the 
bootleg, there may be MAJOR scenes deleted from 
the anime.  A good example is the Tenchi Muyo 
DVD's.  Due to the origin country's restrictions 
on nudity, every single scene with anything 
slightly resembling bare flesh was simple left 
out.  No attempt was made to keep the plot intact. 
 When a questionable scene came up, the action 
simply jumped ahead until it was over, making the 
story disjointed and confusing.

I'm glad I only paid about $15 for the OVA 
VCD bootleg.  It was worth it as an experiment, 
but I'll definitely buy the licensed DVD's 
someday.  ;-)

JP