Good experiences Gyraline alignment app?

I have a mostly custom 1931 five window with aftermarket frame and suspension. I get a good front shimmy above 60mph and the string trick is not an option since the rears stick out way more than the front skinny’s.

Not of alignment shops around here that have ever aligned a hot rod and seemed hesitant so this Gyraline may be a good solution. Any good experiences with it?