I spoke with someone who said although it uses less filament - it actually prints slower than if you printed it as a thin shell. But it looks cool and uses very little filament for large objects. It’s slow I guess because it has to pause for about 3 seconds at the top of each vertical line to let the filament cool.
In FDM 3D printing everything is usually slow. I find this print style really cool, and I’m going to try it soon, but I will use it in a project that involves post-processing and using other materials. In any case, 3D printing requires a lot of patience!