1. Yes, Gorilla makes one that has arm rests, a back rest and foot rest. I'm not sure of the model however.

2. I'm not sure one is "safer" than the other, but with the proper precautions and mindset they are all quite safe.

3. Yes, climbers are very simple to use. You just have to be more picky as to the tree you set them in, and learn the upward angle to start at. It sounds complicated, but it simply isn't.