I just like bottom coils. They are a lot less work. They stay wet. I would be hard pressed to give up my ProTank or my EVODs.
Lovin' Life Without Analogs
I use kanger pro tank with my itsaste mvp, iclear 16 with my smoktech pipe mod, and evod tanks on all my ego stuff (with 1.8 ohm coils put in) they all have their advantages depending on what you are using them with!
While I do use and like the iClears, cost of ownership is another matter. Because of the dual coils, replacement coils are pricey and rebuilding is not an option. Evod/Pro Tank coils are cheap to buy, but even a noob like me can easily rebuild them and really save money.
That is not to say that the iClears are in any way bad clearos however.