The 90 degree mount is perfect for attaching you GoPro to your helmet if you want to shoot as close to your head as possible but still want to be able to reach the WiFi/settings button at all times. Provides really good POV shots with the side of your helmet/head still showing. Also available as compact version for shots even closer to your head.
I try to use and test the accessoiries myself, however feedback, improvements or special requests are more than welcome. You can always contact me with ideas or questions. New products are added to my shop once in a while, so keep around for some fresh new stuff!