I have been using a Corsair H80i with my i9-9900K for the last 3 years and it has been awesome. I originally got a NZXT cooler, but it could not keep the 9900k below 85C under load. I had an H80i on my 4770k setup, so I decided to give that a try. Out of the box, it was not cooling well enough, so I replaced the single fan it came with, with two ML-120 fans in push pull config. Now the cpu does not go over 65 under load. If the 100i is anything like the 80i, this could be a great cooler with a fan upgrade.