I just got my witch installed today and it is sweet! Now it's the witching hour over here.
One tip that I'd like to mention to everyone. When you remove the cryogenic chamber and the plate underneath it, before you install the red smoke, I recommend that you change out the rubbers on the posts beneath that plate (the posts to the left and right of the switches underneath the witch).
I say this from experience. I installed the entire new witch. Everything was working great. I got all the wires zip tied and cleaned up nicely underneath. Then I put the playfield back down, and I see a rubber rolling down the playfield. And, of course, it had cracked and come off of the post directly under the witch.
So, I had to take the whole thing off again, far enough so that I could access that post to replace the rubber.
All is good now, though. Got everything put back together and the witch is great!