Here is my safety I shared on another thread here recently. I ordered by safety components the same day I ordered my RS7 curve. I knew there was (always is in most anything) a slight change of failure, mechanical or mental, but I also had read many positive comments about the comfort and ease of operation of the strap. I chose to go with it with a safety attached to the original camera body support point. That eliminated problems with failure of the grip as well. The first time I used it was all day in Disney World with body with 18-135 attached and toting 4 year old granddaughter most of the day so we could cover as much of the park as possible in one day. The strap did not disappoint.
Edit: I do like the split ring used on the strap by a previous poster - I think I'll change my anchor point.
Safety Strap by Randy Digby, on Flickr