by Wilberforce on Sat Sep 29, 2012 7:46 am
As you said, all the really fun stuff is reserved for the higher-end models, although there's an assortment of under-the-hood improvements that owners of the 3GS and 4 get. Siri gets improved UK knowledge, and Facetime now works over mobile networks, not just wifi, but those aren't things that a 4 is allowed to do.
It shouldn't make any difference to you, performance wise, most apps will launch in about the same time, some quicker and some slower. Battery life might get a bit of a boost, too. Other than that, it's mostly housekeeping - mail gets a tweak, safari gets proper tabs, the lock screen gets a couple of extra options for incoming call handling, etc...
I've not bothered with it, yet. The one feature I really wanted was the DND (Do not disturb) because for somebody who works nights I don't want just anybody to be able to ring me at 10am trying to sell me stuff, but if my Mum rings at that time, there's a good reason for it - it's a feature that even my elderly Nokias had years ago, yet the iPhone only ever had on, or mute.
Unfortunately the kicker is, Apple and Google seem to have had a falling out. Youtube and Google Maps are gone, replaced by Apple's own offerings. There's a new YouTube app to download, but Google has no plans to do the same for it's maps currently, and Apple's take on things is woefully inaccurate. Google Maps also give you traffic speed sensor info, which is amazingly useful for a truck driver.
At the moment then, for me the cons outweigh the pros - so unless the maps improve, I'm staying on iOS 5.