just because it has a spot for 2x120mm fans it doesn't mean it space for 2x120mm plus the rad. they sit sandwiched together so just because the space is there, it doesn't mean the width or thickness needed for the rad+fan is there and it will probably either hit the psu if it's top mounted or the motherboard if the psu is bottom mounted.
My first case was a 2x120mm spot so i thought, great, I'm golden. got my water cooler opened and onto my board, then tried to put in the case and it didn't fit. had to take my case back and buy a case that cost $60 more, and it still fits pretty good but not the best. ideally you want the two fans pushing out then the rad on top. it doesn't fit that way in my case, it only fits with the rad and then two fans on top pulling out. not as ideal as i really want, but it is what it is. i already opened the cooler and it was either loose money taking that back cause it was open, or take the case back and get another one.
the cooler is great and i can oc like a beast and it's still cool and quiet, just spacing for these things, they don't really make a lot of cases that can fit the big ones in.