It's the most secure of the knots and is visually appealing, but is somewhat tricky to tie. I've got a fair amount of experience with knots, but it took me about an hour of practice to be able to tie it reliably and (relatively) quickly.
I'm not necessarily recommending this to other people; in the effectiveness-difficulty tradeoff, it carries a fairly substantial difficulty penalty that probably isn't really worth it. But there's something about using the ultimate shoelace knot that appeals to me, so I thought I'd mention it.
Its really secure and, from my point of view, really easy and simple to do. However, Im trying to tech it to my wife and for some reason it seems really hard for people not used to it to grasp and be able to make it in a competent way.