I love the hanging monorail and you can see them in my last 2 videos. I like trhe blue, yellow and red ones as they more detailed. I looked into these a lot and there are many videos on YouTube to help you as you probably already viewed. I would like to add some lights to mine as a mod. There is even a video on YouTube of someone who swapped out a motor with a Tamiya and it is fast.
Originally I wanted to have an over rail monorail set on top of the hanger but decided against it after watching tons of videos of them. Really like the Disney ones with their 3 cars. I like the look of the more recent releases of a non-Disney ones but they all seem to wobble too much, side to side, for my tastes and just didn't seem right. I wish they would come up with a design to stop that and make them two speed as they are also quite slow which I think exacerbates the wobble. If you decide to get one let us know which one.