While I do use quite a few addons, I cannot say that I've used any quest help addon except Carbonite.
I love Carbonite. I like the way it looks. I like the function integration.
When I was assessing my needs (quests, gathering, topo-maps, full alt inventory amongst a few others) I realized that I would have to keep up to date a whole new slew of addons.
Carbonite took care of all of that in one download for me.
Since then, it's had to go onto the Blizz starvation diet, but I still have faith in the product.
But the best recommendation is to try it for a while. <nods>