I saw one report on AppleInsider about slow reboots and Safari taking 8 - 10 bounces to start up. That was not my experience. Safari starts up in only 1 bounce on my G5 tower and rebooting is faster after the upgrade.
I enjoy Mac, I have one along with some PCs. But at the end of the day, 8% is 8%. It’s a niche product...a darn good one, but a niche product nonetheless.