Erik,
One thing that I wish that Viking had more of were some good pictures. I read the instructions, but I am not quite sure how you would do a transition to your weak side if needed. It seems that you would have to slip your weak arm out, leaving it around your neck only to get into that position. Is that correct?
To me it looks like they took the Israeli sling, and with some changes came up with a better idea.. neat.
-Bidah