At that price VaporJoes is posting you'll want to buy two of them. They are good beginner's box mods. And it's always good to have a backup to make sure you've always got a mod handy and good to go. And as said above you'll need some 20 amp continuous drain batteries like Samsung 25Rs or LG HE2's/HE4's or something along those lines. I really like them personally.
On top of all the good things listed above about them there is two other things to keep in mind with them though...
they're not fully adjustable like most mods in the respect that instead of scrolling through the power options they are preset at 8,13,20,25,30,35, and 40 whats so like said above you'll probably want to keep it set at 8 or 13 watts for the tanks you're using on your clover as the jump from 13 to 20 is kind of a big one. And you'll want to be careful with it as it is not the most sturdy mod...they are not fragile but I've seen one go kaput from one waist high drop onto the kitchen floor. That kind of fall can kill any mod if it lands right, I just feel like the Kbox just isn't as sturdy as some other reasonably priced beginner boxes.
But they are great little boxes that are hard to beat for the price...just wanted to make sure you had all the pro's and con's to help make sure you make an informed decision.
With that in mind, in my humble opinions the pro's outweigh the con's by far and I think you'd be happy with the little guy