Anyone who teaches BJJ will find this list to be absolutely accurate.
If you are a beginner in BJJ, it may help you get ahead of the curve.
http://nuclearchainsaw.com/2013/02/06/11-things-your-jiu-jitsu-instructor-wont-t ell-you/
Good list. Many of those can apply to many different martial art schools.
In one of my shuaijiao classes we had a guy trying out for the class. He kept blabbing about his experience with knife and stick fighting. Knife and stick fighting is awesome but in a grappling class nobody cares. The guy didnt come back after the first class since the conditioning was too hard for him.
"shoo-shizzo" lol