My SR had the judders bad. I probably spent a couple of hours grand total to get the drum trued with the Emery.
That didn't seem like a long time to solve an annoying and dangerous problem.
Didnt have to pull off tire, drive the wheel to some shop in town to turn drum, wait one week, pick up and remount tire. I've gone thru all of that a couple of times with other bikes.
In that context, 2 hours with the Emery strips is pretty quick.
And free. Almost.
Glen