I move most machines by myself so I am not sure these will do anything for me.
The concept seems simple enough it is similar to the fore arm strap style furniture movers.
I like the idea and as Hwawonyu states above probably not a replacement but I can see how these might be handy for some people to use along with other tools as needed.
Now how to mount the winch higher on my truck so I can slide them off like a zipline