tiny voices :
Personally I do not like closed loop coolers at all because they offer very little over air coolers except being louder.
The Cooler should be fine as long as the tubes are mounted in the correct orientation.
I agree they do not offer much over Air in cooling, but the H80i can actually be quite quiet with the right settings or fans.
Now the only Asetek unit I have used rattles like an old hard drive(and this is the RMA replacement) while my H80i has never made a sound since the noise it makes on the first ever power up(bubble bubble then silent).
I do think an air cooler as long as you have space and good air flow has the absolute lowest maintenance requirements.
I think you could run a NH-D14 for years in a semi clean environment and even half clogged with dust still performs well, while some of the high fin count rads will perform very bad with even half as much dust.