To be honest, I'd never own a closed loop cooler. They are poor performers for the cost and can be matched by good air coolers costing much less. CoolIt coolers even fare worse than Corsair/Asetek/Antec coolers.
i only fear air coolers like hyper 212 might block ram slots, or needs modification to fit... never owned an air cooler, though im completely happy with my water cooler. its very quiet, needs no maintenance.
soooo air coolers are overrated?