I was just checking on the flash trigger voltage at:
It seems that the older versions were 190v and newer examples had been throttled back to 4v. This is also true of old Vivitar 283's that were produced over a long period of time and requirements. It could be that this one is just fine for all duties but thought that if you're considering this aspect, the information may be helpful.
A couple of friends owned these over the years and they swear by them as they perform consistently and have been rock-solid reliable. They also have been using them with new-wave film and digital slr's, too.