Love it. I miss some of the other blowback magic used to incorporate - mainly teleport. It was always a powerful ability, but a non-zero chance of appearing "low" made it potentially deadly.
Naw, just tried Phantasmal Killer on a victim that made their will save and happened to be telepathic so it bounced back on me, so I had to make a will save (failed), got a reroll on that due to a feat (but failed) and then got to make a fort save (and failed). The classic "No, no! Not me! You are not meant to attack meeeeeeeeeeeeeeeeurk!"