I use it on every support-type champ I play, Zil, Soraka, Janna, Galio, Taric. It's quite simply put, the single best summoner spell in the game
i have rl friends that play CV with noct+shen. Shen CV's jungle/behind turret, noct ults, shen ults noct, free kills.
I'm of the firm opinion any trying-hard team should have one CV. But it's hard to get the right mix of champs all the time to make this work, unless you really are trying hard to make it work. =)
Any time i play a support CV is a must. If you're going to support a team, map awareness is one of the best things that you can bring to the table.
© 2014 Riot Games, Inc. All rights reserved. Riot Games, League of Legends and PvP.net are trademarks, services marks, or registered trademarks of Riot Games, Inc.