Wifi is more stable and i have found faster loading web pages.
Battery life seems to be the same
Folders are great
Multitasking excellent just like iPhone
Printing not implemented fully yet
Email better than before
Search function great safari
"early edition"crashes and does not work only one I have found so far.
most apps that can support printing will needed to be upgraded
Cannot test air function as only have standard apple tv which I do not believe will be supported but to early to know.
Over all every thing is great. No crashes except a couple of apps that will not work.
I had some stability issues when using 3G the first day...not stability of 3G though....just crashing of system. However all day today has been awesome...love the folders option the most.