I finally got my Joker Manor put together. It’s pretty cool, but my set had a surprising error in it. To make a complete loop, the built requires two each of the following parts:
https://www.bricklink.com/v2/catalog/catalogitem.page?P=26560#T=C&C=89
https://www.bricklink.com/v2/catalog/catalogitem.page?P=26559#T=C&C=89
My set came with three of the lower part and only one of the upper part. I have submitted a ‘missing parts’ application at lego.com.
So I haven’t tested out the whole track, but I can run the coaster around most of it. It’s a nice smooth ride and it really moves on the steep hill. It’s ten rollercoaster parts to make the Joker Manor loop, it looks like if I wanted to buy just that on BL right now it would cost me about $40, and that the parts are all about the same in price.