Ive tried several different ball heads and of them, this little guy has been my favorite. Its light, has a simple construction and most of all is reliable. The bogen 3265 grip ball head, while it "looks" cool- will stop working after a year, and the 486 has twice the load capacity at 13lbs. For $70, its a a great investment! Check out the reviews at BH Photo.
Bogen 486 Ball Head with Quick Release Plate