I know it's a bit late, but i wanted to test it for a while and see if the result changes.
I am never going back to air coolers. I don't know why people complain about the sound problem on these, because i can't even hear my computer turn on. It might be the 2 dampening cable i used while installing to reduce the voltage to the fans, but it still function wonderfully. My CPU is a consistent 30c during regular use and maybe as high as 45-50 during gaming (Total War Shogun 2, Skyrim) with both games running on ultra settings.
I mentioned a while back that my friend owned the H50 and those were terribly loud, but i think he just forgot to use the dampening cables that came with the cooler.
While it is still a bit more risky than using conventional fan coolers, but the lack of noise and high performance makes up for it. It's significantly safer than going with a full water cooling kit.
Edit: I forgot to mention that the Hydro series all comes with Shin-Etsu thermal compound already applied, definitely the best stuff on the market and much better than Artic Silver. They kinda slapped a huge chunk on to it though, so you might want to do some scraping to make sure there are no air bubbles.