Climbers are good and it shouldn't be a problem - If you use a lineman's belt on the way up and down and you'll be safer than not.
They've been in use for decades so it's nothing that is radically new or unknown. I've used Summit, Lone Wolf, and Old Man climbers in the past. I think that summit was the most comfortable and old man was my favorite (lighter weight, lots of load capacity and modular used for archery and rifle).
They do have limitations though. You'll be looking for a perfect tree in the woods above an x marks the spot location. I would suggest identifying that perfect tree prior to hunting. It can be done for sure, but mobile hunting can be a pain when looking for that near perfectly straight tree without any limbs in the way, in the moment and in the dark.
Haven't used one in a while (other than practicing archery), - when climbing trees these days I use a saddle which seems substantially safer and lighter to carry.
I believe that someone on here was selling a saddle a while back.