I have the same experience about the Horizon camera as Wotalegend. I have the S3 U-500 (shutter speeds 1/2th to 1/500th, that's the difference with the Pro:
http://www.rugift.com/photocameras/panoramic_horizon_s3_u_500_camera.htm).
The shutter times are selected with a rotating dial that has positions for (in pairs) (1/60th;1/2th), (1/125th; 1/4th) and (1/250th, 1/8th). You select either the fast range or the slow range with a switch behind the rewind button on top.
I'm not sure about 1/15th: the slow times are obtained by diminishing or enlarging the gap between the first and second "curtain" (it are not really curtains, more two cylinders turning inside each others).
There's no corresponding speed indicated at the 1/500th position (where 1/15th would be; the S3 Pro does not have a 1/500th position, hence no "place" for 1/15th, as the U-500 has no "place" for 1/1th; study the pictures of both cameras), but I have the impression the gap is narrower when I fire the camera in that position then when I fire it in the 1/8th position, indicating it could be 1/15th there. I'll give it a try with my next film, just to see if there's a difference in exposure visible.
It's in a different league, but still, when I pick it up, it gives me the same impression as the Fuji GSW690III. It looks all plastic (but the Fuji certainly is not), but it's nevertheless quite sturdy (but as Wotalegend, I'm rather careful with my cameras).
Funny thing with these cameras is that you can put it on a tripod and start shooting in a crowed street, right in the face of people: they usually don't realize it's a camera; it looks more like a land surveyor's measuring instrument.
Stefan.