Honestly, having some privacy provides so much mental space. It give you the ability live without being as stressed out by fears of what other people might do when they see you. With these black window covers, people don't see someone living in a car, they see a parked car. The feeling of security is immense, and it's so much easier to focus on other things besides the fact that you are in your car.
That said, the covers I made have started to wear out after about 6 months of use, but they are pretty easy to maintain if you keep a can of spray adhesive around. I didn't use the metal wire modification, but I might recommend something stiffish to help give them some better structure, and something around the boarder to help it grip the window frame better. They initially are the perfect rigidity and hold themselves in the windows, but now they have some issues staying in the windows sometimes.