It seems to me that those of us who remember using the Be OS all remember it fondly. There are probably enough detractors or those disappointed with BEOS around, but I don't know or come into contact with many of them and none lately. It was a good OS for it's time: Probably the best around in terms of stability and number crunching performance. Had the hardware compatibility list been a bit longer, I might have committed to it totally. It was that good.
Anyway; here's a short history of BEOS that will inform and amuse.