LIKED FEATURES :

> Notifications :

Apple has righted its pre-iOS5 notifications sins in a rather 'inspired' fashion. As with Android, a list of recent notifications is visibly by dragging downward from the top of the screen and new notifications appear discreetly at the top of your screen and disappear after a few seconds. You can even display notifications for individual apps on your lock screen.

> PC Free & iCloud :

arguably the most important changes, these. PC Free let you activate and update device over the air, without docking it into a computer (or wireless synch-ing with your computer, should you want). iCloud is Apple's cloud storage and syncing service, which lets apps store upto 5GB of data and documents free (pay and get more) and subsequently synchronises all your stuff across other devices registered on the same account. Photos and documents on your iPhone seamlessly find their way to your iPad, almost instantaneously.

> Older Hardware :

iOS5 runs on all current-gen iOS devices and supports even the 2-year-old iPhone 3GS.

DISLIKED FEATURES :

> iMessage :

what started off as a Blackberry Messenger for iOS5 users needs serious address book tweaking to be functional. There's also no way of finding out if someone in your contact list is or isn't on your iMessage.

> Ageing UI :

apart from the Notification Center, not much has changed in the user experience and while functioning, it looks rather dated compared to the other platforms on this page.

(sources : net and magazines)