tomscharbach I wouldn't. I think that anybody used to a modern mainstream OS would take one look and run.
Unless...and I don't know this cause I haven't used Haiku...Haiku is a homage or tribute to that era and in reality has modern apps, screen resolutions, speed, and snappiness? In which case I would give it a try.
[I actually found a year ago a live .iso of the original BeOS which was an old thing with, of course, a warmth and familiarity. it was competent, functional, antiquated. it was back to a world of slower computing for sure]