Cutler, who tour managed the Dead from 1970-74, is one of the stars of the film for his no-bullshit honesty and incredible perspective about how the Dead fit into the culture back then compared to another band he famously worked with–The Rolling Stones. In a wide ranging Facebook post, Cutler gave his thoughts upon seeing the finished product and there were reviews both positive and negative. 

Source: Former Grateful Dead Tour Manager Chimes in on Long Strange Trip Documentary : Blogs : Relix