From the description, it sounds like an FF but with a bagazillion mods and options (switchable Germanium and Silicon transistors, external bias control, multiple tone toggles, a “battery simulator” (whatever that is. “Helps DC sound like a battery” just feels hella marketing speak), switchable output buffer - did I miss anything?)
The (apparently patent pending) bias indicator light sounds clever and useful, I guess it changes color if you’re under biased, just right, or over biased