What computer operating system would you be running Premiere Elements on? If Mac, be advised that Mac does not have Chroma Key, Green Screen Key, or Blue Screen Key.
A lot of variables in the green screen videography and photography. Best download and install Premiere Elements 13 and determine if it works for you in green screen workflow.
Generalizing, I think it does a good job. But a generalization is not good enough when you get down to a specific setup with specific details.
We will be watching for your follow up if you decide to look at the Premiere Elements 13 Chroma Key effect (Expert workspace, fx Effects/Keying/Chroma Key).