Just bought a new Summit Viper tree stand, it came with a full body harness(cheaper version of the Seat of the Pants type) that I won't use, got an expensive Loggy harness I like.
The first person to contact me by PM who doesn't have a full body harness, will promise to start using one and won't put it up on Fleabay as soon as they get can have it for free, shipped on my dime.
I took a bad tumble out of a treestand years ago, broke my back and wrist, can't recommend using a harness enough.