There are a lot of complains about a spell that nobody has tried. We don't know how useful it could be. Ftm seems an amazing spell for PvP, but we can only speculate about it's PvE utility.
Seems that every priest in this forum belong to a guild of machines where nobody make mistakes. My guild is just a guild of mortals, so even if Leap of Faith is only a "fail saver" it will be an excellent addition to my actionbar. 8)