I use Summit climbers for most of my treestand hunting. The body harness that comes with them is not difficult to use and I am able to be strapped
to the tree the entire time.
There is a system available called the "Fall Guy".
The body harness consists of a vest, with straps to go around your legs. (I found the vest to be noisy and stiff.) But more important, they have an enclosed, retractable, rope that is attached to the tree up at stand height. Once it is set, the rope stays with you to the ground. Fasten it there and it is ready for you to climb with on your next time out. It rewinds itself as you climb to take up the slack. If you fall, the inertia causes it to lock just like a cars seatbelt. (I think the retractable unit costs around $60.00 without the vest.) This unit will work for any elevated stand, once it is installed up at the level you will be sitting. Unfortunately, they become unreliable once it starts to freeze. (at least mine did) They are worth checking into.
Any safety measures that can be taken, are worth the effort and expense. I ain`t scared of too many things, but Mr.Gravity never sleeps, and if he gets you, he wins EVERY time.