I really like the idea of the Magna shades but my budget just wouldn't support the price. I made my own using material I ordered from Home Depot and magnets from an Amazon Retailer. Cost me about $100. Haven't made side window shades, yet. Maybe my winter project.
The windshield screen works really well. Takes a few seconds to install and cuts the sun and associated heat load entering the coach. During the day with the curtains open you can't see anything inside the coach from the outside. Night time not so much so I still pull the curtains.
Magna Shade has a bunch of You-Tube videos concerning magnet installation, installing and removing the shade and such.