http://everquest.allakhazam.com/db/spell.html?spell=90
guy saying in '03 in comments that it gives see invis
I know on live when Kunark was out (just before Velious release) I used it exclusively and never used Deadeye again once I got it, as Deadeye became obsolete because Shadow Sight gave me see invis
I'll try to dig up some older evidence