They look like a nice deal to me, as long as they hold up to use.
Every ad I have seen, the load is quickly put on the ground, now that may be all well and good, but the last thing I want to do with a load of wood is have to pick it up off the ground to stack it. I would use the device slowly, a little at a time, so the wood is easily reached on the tailgate. Then pile it. Save some bending.