I haven't used it, to be honest I'm very happy with clarity as is. Using a flocculant strain of yeast and cold-conditioning the bottles for a little while goes a long way. Also getting a proper hot/cold break, using Irish Moss, good racking practices, etc.
I know these aren't the thoughts you want to hear, but I'll offer them anyway: I would never regularly put any animal products in my beer, especially if it's not an ingredient (nothing against a bacon beer!) and is only for the visual aspect.
I'm not a vegetarian, but many of my friends and coworkers are. And since one of my favorite things about brewing is being able to share it with everyone, I'd rather keep animal products out of there. Just my 2 cents.