Time machine alone was worth the price of admission. There were also some good unix upgrades in there if that sort of thing carries any weight with you.
Time machine is great, except for the fact that it Denial-of-Services my machine every time it does a back up. It reminds me of the late 1999-2000 when the Anti-Virus programs for windows (Norton/Symantec) would do a full system scan on a desktop and make it useless for an hour. That, and my 18 month old top-of-line spends an inordinate amount of time with the spinning beach ball. And crashes when I plug in a 30" monitor 20% of the time.
I'm hoping that a scorched-earth fresh install of 10.6 will either eliminate the amazing flakyness or alternatively point me to a hardware problem.
That's not exactly a good reason to upgrade by itself.
It could be if you were required by some regulation to use a UNIX certified OS. IIRC, there were little feature changes that warranted the certification.
As for myself, I have an older iMac that won't run SL, a netbook that runs Linux and I am perfectly happy with both.
