The still available Horseman ISS was a Copal shutter with electronic timings and controller.
The shutter is rocksolid, built to last hundreds of thousands of exposures. I have used it for plenty of work, I still have it
in my "retired equipment" storage. I know of colleagues who use it for Multiseries/3D shootings and this thing is like a tank, it won´t break.
Highly recommended - probably the best shutter system ever built.http://www.komamura.co.jp/e/digital/ISSG3.html