http://ozreport.com/forum/viewtopic.php?t=14903

The business end of the release is a major improvement over existing spinnaker designs--the smooth release pin has no sharp edges or catch points--plus will not lock under heavy loads and will still release even if there's no pressure at all in the system. The handle pull is designed to remain on at all times during the tow so the pilot does not need to let go of the basetube in order to activate release, a safety improvement for those situations for a quick bail.

See the pictures at the URL above.