Is Purifier 2pc (shadow) worth it?

[Halliday 1]

At first read, it doesn't seem to be particularly impressive.

 

I have 3 pieces, one piece is solid in my set.

For the 2nd piece, it would be -15 ilvl, and about a 15% loss on weighted stats on the slot.

For the 3rd piece, it would be -10 ilvl, and about 7% loss on weighted stats for the slot.

 

I suppose it might be decent on multitarget fights, and I'm swapping trinkets for single vs multi anyway.

[Woofikins 2]

As the number of enemies increases so does the value of the 2 set. They also need to last long enough for the bonus insanity to give you an extended void form for it to really be a visible difference.