I have been considering it myself, and a good buddy has been using it with very good success. I will hit him up on the why's soon. As far as mono for leader, my only criticism is it shreds quickly once it's water saturated. With huge fish, that can be an issue. Since you only have to use a foot or so at a time, it's one instance where I swear by fluoro.
I wish people wouldn't whore out Colorado waters for the sake of notoriety.