I see a lot of dicussion of the Gitzo 1321 leveling head on this forum (and elsewhere). However the long arm that hangs down between the legs gives me reason to wonder how it affects low level shooting with a Gitzo 1325--I often shoot low to the ground. I also see that Bogen / Manfrotto makes a 3502 Ball Camera Leveller that weighs just under a pound and a half and can hold 30 lbs. (the GItzo is rated for 33 lbs.). It too fits between the center column and head and has 10° of adjustment. Has anyone had any experience with the Bogen? It costs $70 (about $100 less than the Gitzo).