I don't know if it is the same company, but I once saw a 'Karman' brand standing chair which (according to reviews) used a single, plastic gear train, Linak actuator that tended to fail (typical for Linak) and be expensive to replace...
This one looks like it might be great for BM, given the claimed 45km/hr speed.....
Otherwise I don't see anything all that terribly exciting or repulsive compared to the typical industry chairs...
Based ONLY on the pictures and what I could see in the description, the Chinese EP68 that Snaker pointed at actually looks more interesting, in that it looks sort of like an F-55 copy, with a frame that runs above the rear wheels, potentially making it a good candidate for a BM-X conversion... It also has the large front casters that are good for outdoors. Only downside looks like it has weedy batteries.
ex-Gooserider