We were confronted with it yesterday evening.
My GM played it most disgustingly and started with only just missing me on a roll of 2. And I missed it on a pretty god roll.
Pretty horrifying.
So the truly hideous takes a bite out of the other melee character at its second turn and our backs run cold with fear!
When it heals we were ready to just lay down and die in real life.
But we survived! (Also in real life).
And it was one of my best encounters ever.
So i think it's okay. Horrible difficult. But okay.