(Hauteclaire has almost as good stats for both str/mag as Organyx but you can't stagger enemies with Light.)
I picked this weapon because the stats are very nice. You can still get the instant chain ability (with one more item) and the stagger lock is not so bad, when i know am am goign to stagger i make sure a teammate will do it for me. I like Axis Blade too.
Ya, people not using Hauteclaire/Durandal because of the Stagger Lock are simply people who don't know how to use a proper team, or they do, but they're fighting something they want to Stagger rapidly and repeatedly, so they use Lionheart/Ultima Weapon because it can do that.
Personally I stick with those 2 weapons and switch depending on what I'm going in to fight.
I may be drunk, but you're ugly, and tomorrow, I'll be sober.