I would say that it is fairly seldom that a closed loop system leaks. How often have you bought a fail manufactured product? Even if it leaks I think there was about 3-6 years warranty for it. So you could probably get your money back (maybe even for your other hardware)
Otherwise you should consider a noctua nh-d14. It is a air cooler. But probably just as good as the h100i. Almost Everybody who once used it loves it. And it shouldn't be to loud either.