the vantec has a slight buzz, which is noticable if you put your head up to it. its very unlikely you'll hear it from where your sitting though. and well thats with my units which were bought when they first came out , now who knows. i'm sure they put out less heat though.
and they come with all sorts of cable adaptors, which was nice.
turning off fans is overrated unless you've silenced your harddrives and psu. fans at minimum barely move air, let alone make noise. once you get a controller you quickly realize how loud harddrives are, when you turn down the fans, thats all you hear, the godddamned harddrives.
either way, one shouldn't have a setup where you have to constantly control the fan speed. should be adequate cooling even at low rpm, fan speed as i see it just lets you tune the fan noise to the perfect level, not bare minimum cooling on the edge of burn out

well that and gives u the option of turning up cooling when the weather changes..summer heat.