I haven't used them but from what i have heard they are good IF you have something directly in front or behind to tie them to. If you have to tie them to a tree off to the side they don't wrap around the wheels properly. I looking at them last year u......
There are a few videos on YouTube. Pretty hard to find because everyone seems to give them a different name.
bottom line is - it's an expensive bit of rope.
Same as taking some old winch rope and wrap around the wheel
in regards to recovery gear I always make sure it ticks 2 boxes
a) safe to operate
b) has more than 1 use
@Kelvin - if that was a promo post and they gave you a set, I'll see if we can organise a real test in a controlled and safe environment.