It’s quite rare to see a fully functioning roller coaster, especially one this large and complex and using 100% off-the-shelf LEGO elements. It does a look a little fragile at times, with the whole structure wobbling away in the high speed turns, but I’m pretty sure builder Hoezer2 has got it all figured out and it’s gonna hold up. The construction not only has the look and feel of a real roller coaster, but the turns and runs actually have a top speed of 10.3 kmh (6.4 mph) thanks to the use of Mindstorms EV3 motors and sensors.
I still can’t quite grasp how those carriages stay fixed to the tracks, which has always been my number one fear of roller coasters. But in the world of LEGO, minifigures don’t feel pain so it’s all good if they have to endure the occasional derailment.