Got the update at the end of November...was not really expecting a change. Sometimes you update iTunes and can't tell the difference, this took me completely by surprise. I couldn't find my device, couldn't figure out how to add my Christmas playlist to my ipod, couldn't add a new file to my library. I have adjusted and find it okay, but for the first 30 minutes I was glad my kids weren't around, there was a great deal of cursing
The search feature takes a little time to get used to but overall I do like the upgrade. There's a few things that need to be tweaked but its definitely faster which is a big plus. A few additional things, I noticed that they added the cloud to iTunes so all your past purchases showed up even if you've deleted them however you can turn this off and they will disappear. In the search box click on the magnifying glass and uncheck search entire library, I just have it filtered by all which makes the search much more efficient and a heck of a lot faster if not it will hang awhile with the wheel of death.