I bought the rubber ball mounts on carbon plates and the wire mount of plastic plates, both carrying the gopro. Did the same video with each system, also stabilized in Final Cut Pro. Wire comes out ahead, and I think it is equal to a good gimbal without the extra weight, cost, and performance issues. Check it out:
http://www.youtube.com/watch?v=_NcsZqqCDGQ&sns=em
http://www.youtube.com/watch?v=_NcsZqqCDGQ&sns=em