Apple is going with an annual release of new OS. So if you upgrade a year later, you'll be a generation behind.
It kinda sucks for me since I have to be certified every year.

Quote Originally Posted by roninblade View Post
i'm still on 10.8.5. i don't beta test OS's, and i usually upgrade after a year of it's release, 6 months at the earliest. i just don't have the time anymore to deal with release-day bugs so i just let the early adopters deal with that and upgrade after the first patch is released or if the reviews are good.