I did watch and listen to the videos and the Vent II really helps improve the Genos organs big time. The Vent II is better than the YC Stage Keyboard Leslie rotary effect, although the YC is very good too.
NEWS FLASH! I really think that Yamaha has big plans for the Genos 2 organs, including the Leslie rotary effect. Hopefully, they'll include a similar Leslie rotary effect on the Genos 2 that's currently on the YC Stage Organ Keyboard with the 1.2 OS update. Yamaha has recently demonstrated they can compete with the big boys regarding realistic Leslie rotary sound effects such as the Nord Electro 6D, Nord Stage 3, Hammond Suzuki XK-5, etc. I don't know what took Yamaha so long to figure it out, but perhaps they recently hired some personnel with expertise in that particular field, and the results have been amazing to say the least. Hopefully, it will be carried over to the top-of-the-line arranger segment starting with the Genos 2/II or whatever they decide to call it.