As far as spiral escalators go, there aren't that many. Mitsubishi Electric is the only manufacturer of them in the world. A shopping mall in Shanghai has opened with two different types, each going up seven stories.

It's also not easy to make them. According to Mitsubishi Electric:

horizontal speed decreases as it moves along the slope, making circular designs impractical. Mitsubishi Electric's engineers overcame this dilemma by inventing the Center Shift Method, shifting the center of the circle around which the escalator rotates in response to the degree of gradient, realizing smooth rotational movement in perfect harmony with vertical movement.

The escalators achieve smooth movement through specially designed chains that can respond to various angles of motion and rails and handrails made with proprietary processing techniques for optimal flexibility, yet the increased range of motion does not sacrifice precision, as the final processing accuracy is 0.1 mm.