Only users who purchased or rented the product can leave comments
Dimitri Nepomniachtchi  

Very good indicator, but missing notifications!

Example: bar change color. 

bar change color to red or blue in opened bar + shift to direction.

Dimitri Nepomniachtchi  
строю эксперт по нему. к разными стратегиями входа и выхода. кому интерестно, обращайтесь. 
Joshua Mangold  
I also agree that this is a very good indicator and would like notifications added to it as well please!