User blog comment:GimmeStarfoxWii/Exhaust vs CV for Supports/@comment-7996065-20130409124029

"Long cooldown" its short compared to exhaust. Its what, less than 50 seconds with miracle?

"We have wards, traps and sightstones for vision anyway" what if you want to ward an area you don't have vision in? What if you want to ward baron as blue team without having any vision?

Also, warding is not a good idea if you don't have map control. CV gives vision even if the enemy has map control. Also, wards/traps cannot see into other bushes, CV in combat can reveal enemy fiddles.

"Exhaust on the other hand is useful all game" so is CV. It might not have the combat capabilities that Exhaust does, but you always could use more vision.

Overall I would consider them equal on the basis that they are used for 2 completely different things. CV is great for knowing WHERE the jungler is (did he invade our jungle or did he go for their next buff after the first?) and figuring out where the enemy Mid is going if he left mid.