Before this thread is sunk into oblivion; good question but please check your grammar. "Does it" -> "Is it". And I have a MBP and no I haven't upgraded. Haven't found any pressing reason to do so. I actually stall doing updates for like months since they take too long and I can't bother reopening all my chrome and mozilla windows. Probably I should but please don't hack me and don't tell my boss. He's one of the security-crazy-people.
Thank you for your comment. I fixed the grammar. :)
Why would you give it any thought at all? The update button appeared, and just before dinner I clicked "update". Done.
Why bother upgrading? There’s nearly nothing to gain but tons of pitfalls such as unexpected breaking changes.