While I would agree that the Rigger’s Belt is mostly a marketing concept (there are fake one’s out there, so be careful if decide to use the belt as device), I would almost always want to be attached in the front. By being attached in the front, you can assist or even accomplish self-rescue. Rear attachments basically make you a passive by-stander in your own survival. The only two times I have seen/used rear attachment points is with a tag line for confined space and for the door/hoist operator for helicopter operations.

Pete