the downside of using it just for using it is that it throws off rythmn, when farming titan ex back in 2.1/2.2 or whatever it was the healers knew when buster was coming and precasted by at least 1 second, just an example but healers do that 100x in a fight if they know the patterns and you get a feel for when you need to cast, PoM just disrupts your flow so it really is only for when you know steady fast high damage is coming and cure2>cure2 being a lil bit faster makes you sweat a bit less, i can't even think of 3 instances where that happens