Magnetic Polarizer from Breakthrough Photography

Recently I had the opportunity to use a new product from Breakthrough Photography.  They have a new ring which can use not only their square and rectangular holders but also a magnetic circular polarizer.  Check out the video!

Update:  The holder does have slight vignetting at 16mm and can be a little stiff to manipulate.  However, I have been contacted by Breakthrough and they are working on a new one which should eliminate both issues.  Stay Tuned!