What attributes are key to run the Flex Offense?
Thought there used to be a HD 101 that explained the offenses, but cannot find it.  Help anyone?

http://www.whatifsports.com/hd/help/hoops101.aspx

Flex
Summary
The Flex is a variation of the motion offense in which all five players are interchangeable. The offense is taught to react in specific ways based on the defense.

Pros
Doesn't require a big presence inside to be effective, allows the offense to spread the floor and use quickness to penetrate to the basket or draw the defense in for open outside shots.

Cons
Requires good passing, speed and outside shooting.

I like bigs that have some perimeter and guards that have some low post since the guys move around a lot. 

Fast guards who with good perimeter skills are a must. And good passing will help too but that is true in any offense. I run flex at the DIII level and my best teams have had 2-3 very effective outside shooters. Think 75+ ratings. When I don't have guys who can shoot the 3 I generally have a poor offensive team

here's the same topic discussed in another thread

http://whatifsports.com/forums/Posts.aspx?TopicID=439924