I haven't heard about to many but my buddy at work had a pretty bad, well really bad accident opening day. While using his climber, the cable on the top piece snapped. Luckily his feet were hooked into the bottom piece. He fell completely backwards and was hanging by literally his feet and ankles. Also luckily he was hunting with his wife that day and she heard it and heard him yell, called the squad/fire dept and they had to come out and help him. I saw a pic, let me tell you it was crazy as h*ll! I'm not sure how he was still hanging, all his weight on his feet/ankles.
So anyways yes I agree that life lines should be including when you purchase a safety harness. I also don't use one while climbing but prolly should.