I thought it would be ultra important, but have realized getting into the 30s with my cleric that u just haven't used it at all, I mean the reason it is meant to be so good is because we don't get invis, only invis to undead, but seriously I think the diety gear would've been more useful.
Also once you get into raiding it won't matter.
All that matters is that you can wear this.
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http://wiki.project1999.com/Robe_of_the_Azure_Sky
But i myself only want my cleric as a rez bitch and a slot to fill if the raid requires a healer instead of my mage :P
So it really depends if you are going end game with him or not.
And once velious comes it does get a little better
http://wiki.project1999.com/Akkirus%...e_of_the_Risen
But still the winner is this guy
http://wiki.project1999.com/Sal%60Va...be_of_Darkness
So choose wisely and no what and why you are missing out