Any recommendations on good solid camcorder handgrips for use with the FX1, XH A1 or larger video cameras?

Anyone using the Cavision handgrips?
Single Handgrip for ENG cameras (RSHS-ENG) (http://cavision.com/rods/RSHSENG.htm)
Single Handgrip with Mini-DV Plate (RS8HS-MP) (http://cavision.com/rods/RS8HSMP.htm)



Notes: I have the Video Innovators hand grip, but it can't support the weight of an XH A1.