question about this German-based script system for English

Hi guys,

I'm curious about this system--Natural Shorthand (aka Roller's light-line phonography). It looks beautiful, is compact, stays on the line almost obsessively, and seems brief. Even seems to have a good pedigree, being an English adaptation of Heinrich Roller's German system. My question for those of you who are into these obscure systems is this: what speed could someone likely get with it, and if you had to compare it to a Gregg version, which one would it be?


(by thousandwaves for everyone)