It's just a shame the d15 looks so bad. I wouldn't have one for that reason alone as they match virtually nothing bar maybe a sabertooth board. The other annoying thing with some of these larger coolers is ram clearance. You're left with very limited choice like default vengeance or removing heatsinks.
I think mine ( D15S ) looks great, and I have Corsair Dominators without an issue.
It also beats the snot out of my old H110i GT that had Noctua IPPC 2000RPM fans on it. Significantly quieter; and superior cooling.
Highest peak temps in AIDA 64 after hours was 60 degrees, with all cores at 4Ghz. In actual work loads after hours on a project the highest I've seen is 57 degrees.
At Stock settings in AIDA64 my CPU never had a core exceed 50 degrees.
This is all with one fan that's rpm range is 900rpm - 1150rpm
And as value for money the D15 is miles better than 240mm AIO, let alone 120mm ones!
It handily beat my 280mm AIO that I installed Noctua IPPC fan on as well. Cheaper; quieter, cooler, and leak and pump failure free.