I have a dual 12 inch, its incredibly bright and it overrules all the other leds in my case. If you're looking for a dim look, then don't go with cathodes.
i use to. they look sweet for a little then they get annoying. same thing with the clear side panel. now im back to a solid case(no see through) for noise reduction and better for cooling.
its mostly a taste thing, someone else really can tell you if your going to like something lol.