After abit of use I found several limitation to it. The teleport/mobility part of the skill seems iffy. You have to stand on basicly very if not completely flat terrain to be ported 15m as it sais it will. Even just the smallest little bump in the road will cause you to not move more then 1-2 meters instead of the discribed 15m.
Im used to how Streak on my sorc works, it will basicly port me wherever I want except very steep uphill it will port quite short, but thats fine. Vault, however, feels very easily "fizzled" when you use it in rough terrain, even small stairs it cant get you up those.
PC EU
PvP only