they are made by Armscor, the same people who make RIA. I have no experience with a Citadel, but I think they would rate right up there with the RIA's, just a bit more option loaded and a little more expensive. Someone here may have one and give you a better answer toward their performance and reliability.
"There is no hunting like the hunting of man, and those who have hunted armed men long enough and liked it, never care for anything else thereafter." - Hemingway
The greatest ignorance is to reject something you know nothing about.