I bought this to use Virtual Background in Zoom. I didn't want people to see my messy office in the background. For that purpose, it works well. I wish there were instructions for using a green screen with other applications, like Skype, Hangouts, etc. I tried OBS, but it is too complicated for me to figure out.
Advantages: Creates a quick and easy green screen attached to the back of your chair. Easy to attach. Fairly wide to block most of the view behind your chair.
Disadvantages: I have the square version. Since the screen comes / stores in a small bag, the screen does not stay flat when open. The slight curve in one corner creates a flaw in the virtual background. This flaw wouldn't apply to the ROUND version which is completely flat. I just needed the square for my work.