It's much better than Previous-Overlay-Which-Must-Not-Be-Named.
The reason this overlay works is because it accomplishes what it was designed to do - give you a little scare. And it's not over-the-top or corny about it, like Red Hot Chili Mountain was (it was scary, you have to admit).
My first time riding it was spoiled by a bunch of CMs in business shirts wearing bright green flashing necklaces. You could totally see the tunnels which were supposed to be pitch black. During the ride, their necklaces lit up parts of the track. Yet it was still a creepy experience not knowing what was coming.
I rode it the 2nd time and it was much better. It wasn't as scary because I knew then if something was or wasn't going to happen in certain dark areas.