I have the H100i, I wanted the Kraken but it was out of stock. Besides my adventure making the stock fans shut up (will make a thread about that soon) I'm happy with it. At full load and all 4790K cores at 4.7GHZ (torture test) it hovers around 70-76C.
At the minimum 600 RPM (and all other fans in the case off) it gives me idle temperatures at 34-38. With the other fans running and at medium RPM it stays around 30C.
Btw: These temperatures are not the stock fans. With the stock fans they are a bit lower. The stock fans are excellent, apart from them making a mechanical clicking noise at very low revs (400 RPM).
While gaming I'm at 45-50C.
I'm pleased with it, but it has some issues. Corsair customer service is however excellent.