Their early arms were poor - modified Regas.
I haven't seen their latest top arms but they use a different principle with the main bearings. As I understand the OL bearings are "loose" and rely on stylus drag to lock in. Roksan used a similar principle with their Artemiz.
The top Rega arms use traditional gimbal bearings are handbuilt and take many man hours - each part is "blueprinted" and triple checked before during and after assembly.
This is not unique - most of the great arms Breuer, Sumiko MDC800 for example were great, not because of unique design, but because they were hand assembled by a superior artisan. both arms I mentioned were only ever made by 1 person.