Here are some very usefull links if you're thinking of migrating to OS X 10.9 (Mavericks)

[Electric Monk]

http://www.macworld.com/article/2056882/os-x-mavericks-review-free-as-in-beer.html

http://www.macworld.com/article/2056543/installing-mavericks-our-complete-guide.html

http://www.macworld.com/article/2052602/get-your-mac-ready-for-mavericks-os-x-10-9.html

http://www.macworld.com/article/2056561/how-to-make-a-bootable-mavericks-install-drive.html

[Sherman A1]

1. Thanks for posting.

I have a new desktop that I will be starting up later today. I was planning on downloading Maverick, but will read through these pieces first.

[sir pball]

2. I just...upgraded. So far, nothing has really changed.

It's the most "silent" upgrade I've ever had. Been two days and nothing is noticeably different - just longer battery life and a general snappiness. Then again, I don't use iOS so the new integration is irrelevant to me. No complaints, though!

[Zorro]

3. Upgraded 3 systems + 2 iPads with no critical problems

The wife complained that the new iTunes won't play Quicktime mpeg files, so just have to convert those songs to an audio format.