Hyrdostat Ball heads

I just noticed these at the Manfrotto site.
http://www.manfrotto.com/product/ite...&sectionid=311

From the site:
"The 468MG is the first ball head in the world to incorporate a
hydraulic system to lock the ball mechanism in place. Using hydraulics
instead of a mechanical system produces a super-tight lock from a
minimal turn of the locking knob, without sacricficing the smoothness of
the ball's movement when unblocked."

Has anyone tried one of these yet? Comments?

Cheers,
Alan

--
-- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm
-- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm
-- [SI] gallery & rulz: http://www.pbase.com/shootin
-- e-meil: there's no such thing as a FreeLunch.