We have seen Apple shipping great products over the years, but to knock our socks off at every major event is something that you do not see anywhere else in the computing industry. Perhaps it will become Apple's trademark. Mac users have accepted their niche market for too long, and Jobs is not satisfied yet. I downloaded the updater and installed it Monday. I am satisfied with that.
Performance seems zippier.
My extensions paraded faster at startup, and my desktop was ready to go earlier than with 8.5. I really like the fact that the RAM taken by the system was pretty much the same than with 8.5. The worst problem I noticed is that there are no improvements when it comes to user interface. My impressions come from one day of use, but I can already say that I like it. I recommend that you get the upgrade CD if you already own Mac OS 8.5.