It’s almost feature complete, it’s well tested, and it’s very fast. But it could always use more testing (especially on real world projects).
It’s very safe and robust, but theoretically in extreme situations it could mess up your bone’s parenting, so make backups of your .blend files!
Also, don’t add any objects into the RigidBodyBones collection, they will be deleted.
Note that you need Blender 2.91.0 or higher, because of a severe bug in earlier versions of Blender.