iCloud, MobileMe, Aliases/Aliasi, disabled Aliases etc
Ok, here's my $0.02.
Transition to iCloud as a former iTools --> .Mac --> MobileMe user was initially not able to be completed, and I was given the "error try again later screen" several times.
Late last night, I attempted it - and it completed.
MacBook Pro
Everything works flawlessly. Mail app is still using MobileMe settings (i'm sure a software update will fix this.
iCloud system preferences pane is pretty much the central hub to all things iCloud.
I noticed that when I try to click the "Mail & Notes" check box the system constantly unchecks it when I close system preferences.
Photo stream requires and update for iPhoto. You then need to go into iPhoto and enable photo stream. Then you need to enable it on your iPhone. Haven't figured out where to go yet to actually see the stream.
iPhone
There are some bugs - iPhone sometimes says that the login and password is incorrect, even though all info is correct and it downloads emails sporadically when it's operational.
Wifi sync & iCloud sync work perfectly.
There is a actually iCloud setup like MobileMe, but 100% more baked/clean.
Airport Extreme
This may need an update - I have a new message that says "MobileMe login or password is incorrect". I have triple checked this and I presume it's because of the iCloud transition.
Aliases / Aliasi
If you have multiple like I did, but back in June when they disabled the ability to enable/disable/add/remove aliases - the good news is once you transition to iCloud all alias functions come back. You are able to add/remove/disable/enable aliases. What about aliases that you had that were disabled? They transition as well, though you will have to re-enable them in iCloud.
Someone said that what if you login to iCloud with one of your aliases - I tried and it didn't recognize my login/pwd combination. You have to use your apple id or your MobileMe main account info. If your experience is different - please share.
Hope this info helps someone.