By request again, here's the link to my review on the Arcatech Ultimate Ballhead (mounted on a Gitzo G1325) vs the Arca Swiss MonoBall B1 (mounted on a Gitzo G1228).
http://eoslightbox.com/reviews/Review_ATUB_G1325.html
http://eoslightbox.com/reviews/Review_ATUB_G1325.html