This is my previous kammback that I had. It did help but I decided to lengthen it nearly 10 inches, raise it a degree or two and also add the side panel.
Worthwhile or no?
Old.
New. I did enclose the drivers side as well.
Without doing a full boattail I don't think I can do much more to the car. Maybe some rear wheel covers. Any other ideas. I use the hatch all the time so I can't justify a boat tail.