We have machines scattered throughout the office for meetings (mostly Jira or other web applications). One of those has Haiku running and people seem to like it just fine.

I do find, however, the ergonomics of the window manager to be atrocious. The little tabs, while faithful and part of the visual identity of BeOS, are, perhaps, the worst idea since the invention of overlapping windows. I'd suggest focusing on the 80's icon style and 45° perspective as visual identify and ditch the title tabs.