I used Live Update to do a fresh install of F17 on my Dell Studio 17 laptop and it worked flawlessly. Prior to the upgrade, I did a full backup of my user directory in a F16 session using Deja Dup. Once 17 was running I simply did a restore to get back all my data and app settings. I installed some applications that I did not backup(databases, IDE's, web servers, etc.) and I was back in business.
This has been the smoothest and quickest upgrade that I can remember in a long time. (I have been using Fedora since version 4) My compliments to the developers. F17 is great!