I first read about SCARM here about half a year ago. Finally decided to try it for the mainline layout I'm working on for the club. It took about a half day to get past all the basics that I didnt ubderstand and I was finally able to draw the area outline. The next day I managed to get the rest done. Now for slowly tweaking and adding scenery.
One problem I had is that in some places the track matches but does not jopin, which makes length measurements hard as I cant highlight a complete circle.
I used mainly Ross track sections with a few Gargraves shorts and flex as necessary mixed in. Also an Atlas turntable.
There is about 750 of mainline on two levels. The connecting grade is 2%
The 3d view is very handy to explain the levels.