I currently have a 4x5 and giant Studioball head but I am unsatisfied with the d egree of precision afforded by the ballhead. It's floppy and a bit tough to leve l precisely. I am considering switching to a Ries double tilt or Gitzo 3-way pan head. The control levers on the Gitzo look like they might stick out too far an d get in the way while examining the groundglass. I'd appreciate comments from a nyone who has used either the Gitzo or Ries head. Thanks.