My climber is an API grand slam that is as comfortable as my recliner at home. With my full harnass, I feel very safe and secure and have never come close to falling. I get up and move as much as I want, no problem. I'm new to using a lock on and not NEARLY as comfortable with it. Once I'm on that platform I limit my movements and am very careful when I do move.
It's a dangerous game...stay safe and wear a full harnass.