I did use BeOS on a PC of that era. I was impressed, but it was a bit under-cooked.

In more recent times, I boot up Haiku-OS every time a new alpha version comes out. It certainly continues the tradition. But to my eyes it hasn't materially improved upon the decades old promise and fails to sufficiently take advantage of current hardware.

With due respect to the Haiku-OS developers, I think that too much valuable effort is expended on trying to port all and sundry apps to Haiku. I would have thought that making a decision to port a single product and doing it well would be far more effective. It isn't that hard to learn a different product. For example, I have with minimal effort made the transition from MS Office, to Apple Page, etc to LibreOffice. As long as I can do what I require, I'm willing to adopt whatever is the standard.