It depends on How much you play and who and what level you want to play at.
If you just play the occasional CC tourney and a few matches with slightly better players, I would wait for the level 100 irons.
Now I switched from Level 81 Ping irons to the 97 level Callies. I'm finding the green much easier. I'm in a level 20 CC. with 50 Champion level players.
So..If you play everyday and want to compete at all levels. Get these irons.