A couple of crummy (but thankfully short) videos...

[Herc Driver]

Good video - I can see the difference. I super-elevated the curves on my layout...more to insure the trains stay on the narrow shelf layout and not rocket off onto the floor or hit one of the three walls that border the tracks. I placed styrene (I forget the exact size...but it was the thinnest sheet I could get) under the outside rail. The trains have a slight but perceptible lean into the curves.